Sounds like YouTube being over zealous with it's algorithms, does seem quite odd. Perhaps the Hardwired demo contains a copyrighted image?
It wasn't unusual for people to rip art from copyrighted stuff back then and plonk them into demos..
EDIT: As you're using this footage for the purposes of highlighting the demo scene (and not passing it off as your work), I'd dispute it with "fair use" terms.
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