None of that says what you are saying.

Maybe you could highlight where it says that any NATO members did not participate in NATO operations in Afghanistan? Or that any participation is voluntary?

Seriously, man, you don’t know what you are talking about. It’s not voluntary, otherwise the alliance wouldn’t exist. States have the discretion to decide the kinds of aid they would send, but any decision not to respond at all would be counter to both the letter and the spirit of the treaty. It’s mandatory, if a country wants to abide by its treaty terms. Full stop.

The only flexibility involved is exactly how it responds. Here’s a source that explains it, but I’ll quote the relevant bit for you. The excerpt follows the text of Art. 5 in the source.

“This language is relatively flexible. It permits each NATO member to decide for itself what action should be taken to address an armed attack on a NATO ally. It does not require any member to respond with military force, although it permits such responses as a matter of international law. A member may decide that instead of responding with force, it will send military equipment to NATO allies or impose sanctions on the aggressor.”

https://www.brennancenter.org/our-work/research-reports/natos-article-5-collective-defense-obligations-explained

Here’s the information about what the NATO exercises that occurred as a direct result of 9/11. It’s a lot, but here’s the relevant bit, where it outlines what the actions of the alliance were:

“After 9/11, there were consultations among the Allies and collective action was decided by the Council. The United States could also carry out independent actions, consistent with its rights and obligations under the United Nations Charter.

On 4 October, once it had been determined that the attacks came from abroad, NATO agreed on a package of eight measures to support the United States. On the request of the United States, it launched its first ever anti-terror operation – Eagle Assist – from mid-October 2001 to mid-May 2002. It consisted in seven NATO AWACS radar aircraft that helped patrol the skies over the United States; in total 830 crew members from 13 NATO countries flew over 360 sorties. This was the first time that NATO military assets were deployed in support of an Article 5 operation.

On 26 October, the Alliance launched its second counter-terrorism operation in response to the attacks on the United States, Active Endeavour. Elements of NATO's Standing Naval Forces were sent to patrol the Eastern Mediterranean and monitor shipping to detect and deter terrorist activity, including illegal trafficking. In March 2004, the operation was expanded to include the entire Mediterranean.

The eight measures to support the United States, as agreed by NATO were:

to enhance intelligence-sharing and cooperation, both bilaterally and in appropriate NATO bodies, relating to the threats posed by terrorism and the actions to be taken against it; to provide, individually or collectively, as appropriate and according to their capabilities, assistance to Allies and other countries which are or may be subject to increased terrorist threats as a result of their support for the campaign against terrorism; to take necessary measures to provide increased security for facilities of the United States and other Allies on their territory; to backfill selected Allied assets in NATO’s area of responsibility that are required to directly support operations against terrorism; to provide blanket overflight clearances for the United States and other Allies’ aircraft, in accordance with the necessary air traffic arrangements and national procedures, for military flights related to operations against terrorism; to provide access for the United States and other Allies to ports and airfields on the territory of NATO member countries for operations against terrorism, including for refuelling, in accordance with national procedures; that the Alliance is ready to deploy elements of its Standing Naval Forces to the Eastern Mediterranean in order to provide a NATO presence and demonstrate resolve; that the Alliance is similarly ready to deploy elements of its NATO Airborne Early Warning Force to support operations against terrorism.”

https://www.nato.int/cps/en/natohq/110496.htm

I have to assume you don’t have any interest in good faith argumentation at this point, and it’s time for me to call it quits on trying to convince you. But please stop spreading Russian disinformation and in the future remain silent when it comes to Article 5.

Edit: I’ll put the Wikipedia link for the ISAF, the NATO-led force in Afghanistan, too, but if you go to the tab “participants,” you’ll read this:

“All NATO member states have contributed troops to the ISAF, as well as some other partner states of the NATO alliance.”

https://en.m.wikipedia.org/wiki/International_Security_Assistance_Force