That ("They are listening, filming and tracking every single thing you do near that device") is a claim you're going to have to substantiate. Don't spread such rumours unless you can back them up.
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.