Honestly, it's pretty far into the PS5's lifecycle at this point. I think a PS5 Pro this late into the current generation would be a bad move, because a PS6 is undoubtedly around the corner in just a few years and will effectively obsolesce a PS5 Pro, anyway.
If they released a Pro version last year, that'd make more sense. But unless Sony's expecting this generation to stretch out longer than normal, this just doesn't seem like a good idea.