Looks like a concrete floor there, which would generate dust, therefore this just can't be a clean room by definition. If so they'll probably just have to clean up the paint and maybe replace a few things and get on with it.
The second action in the video, looks like putting expanding foam into the air filtration system, is much, much more damaging. That's building infrastructure that will have to be torn out and rebuilt, which will shut down production for ages. A lot of people are going to be a lot of angry about this, and these two on camera are going to be hunted down and prosecuted.
I don't think shutting down production of warplanes that are already in service will do much to be honest. It won't slow momentum of Israel's genocide one iota. You could devastate the population of Gaza with WWII era planes, since they're basically at this point just starving to death without electricity. So no need for F35s. I get that it's a strong form of direct action but the actual effect it will have is minimal, and balanced with the risk to the protesters, it's pretty low on the reward/risk scale.
I think these two are morally in the right, but need to think more about how they can be effective.