Yes, so how many, 12 years old GTA V received a 60fps version on PS5pro (upscaled 1440p), that definitely doesn't give much confidence that GTA VI can do the same (probably with lower res or lower graphical settings)... We can't even see how RDR2 would do on PS5/pro because it's still capped at 30.. So I think this 60fps GTA VI is just s huge fans copium...
Sony and Rockstar seem to have a marketing deal in place that is enabling collaboration of engineers on both sides. This is said to culminate in 60 FPS support for GTA 6 on the PS5 Pro.