YouTube link to the video: https://youtu.be/Yr8oJWS9sJo
I skimmed through it and it’s as stupid as you’d expect. The person in the video pretends to connect wires together, plugs a USB cable into a phone, then downloads an app to prove the increased internet speed. Comments are disabled and generic music plays over the video instead of any commentary.
Someone on twitter posted the most likely source: https://www.pixiv.net/en/artworks/87271896#manga
It looks like this isn’t actually from the original show.