1. This exploit simply replaces the original micro with a new one. With good craftsmanship (the same kind that would make enclosure manipulation undetectable) you wouldn't notice anything. So it wouldn't actually prove anything if you inspect visually by looking inside.
2. The way the enclosure is designed is either with one piece plastic or an aluminum backplate which appears to be designed not to be opened.
So the attackers would have to manufacture the whole imposter device from scratch. Possible but lower risk.
