This sounds good in theory, but only in theory at least right now.
On Intel, XeSS uses the XMX hardware block. On other vendors, it uses DP4a instructions. Right?
The only problem is: only Intel has a standard DP4a implementation for graphics APIs, the other vendors use propriety stuff.
So even if a GPU supports DP4a instructions, you as a game developer can't use it.
Of course AMD and Nvidia could take a deep breath and make a standard API implementation, but where's the business in that? Especially for Nvidia?