REZ HD didn't have Sega on it at all? Good to know, thanks!
It did, to an extent. The title Screen has 'SEGA(tm)' and of course the end credits. Basically it's SEGA's IP and SEGA will probably see some profits from it... Just like Shenmue 3 and Bayonetta 2. But they are not against allowing the original creators to invest further in their work even if SEGA are not strictly interested in doing so, inhouse. Personally I think it's a pro, not a con and a very admirable thing for SEGA to do.
Though actually this may actually be a SEGA published game, we don't know the details.