Right, but the fact that they had this and showed it at all rather than just not showing any bit of Tarkin would indicate to me that they filmed all (most, some?) of his scenes for real with Guy Henry’s actual face and it’s sitting in a vault. Again, they professed that they didn’t shot any of this without the intention of Frankensteining Peter Cushing and they had no safety. If this is Guy Henry, I think it at least puts to lie that notion.
Maybe, but “discovering” this “lie” will not actually cause that footage to be released in any form so 🤷♂️ there’s no point in getting excited about it. Far, far more likely that there was a shot that was usable without much effects work (removing tracking dots without doing the full CG perhaps) for the trailer.