Haven't watched the video, but how does this work out in practice?

How can a CNC differ between my own design and a design I've got from a homepage?

Also, how can they block me from sharing my designs for fixing something on a device?

I'm a quite flabbergasted how this should work

Or is there no practical mechanism, only the law that makes everything illegal I try to fix?
That would also be quite an asshole move, but who cares, when I fix a broken hinge in an old appliance?
As long as I don't return it for warranty, the producer has pretty much no say, what I do with my fucking stuff...?