While I like the idea and the listed apps are just awesome (didn't know about termux, wow), the whole setup depends too much on google services for my taste :-/
Can't imagine what recording webcams would do- but I suppose it might be effective for something.
Because there's no actual evidence to support it.
He's suggesting they are secretly filming you, logging your keystrokes, and rerouting your mic audio. That is a very bold claim that should be backed up or retracted.