I’m seeing the same thing.
Windows 11 has always had an official system requirement of DX12 but it’s never refused to install because of VMware’s SVGA being DX11. As far as I can tell, Parallels doesn’t support DX12 either.
I’m not sure that it’s because of DX12 though. 22H2 upgraded to 23H2 in a Insider Preview Beta Channel build VM that Inhave. Rather I’m inclined at this point to believe that they are staging the upgrade and haven’t released it yet. I’m going to wait a bit longer before being concerned, since a lot of what was originally supposed to be new in 23H2 has already been released to 22H2.
Maybe can see if VMware can contact Microsoft to see what’s the hold up?