Rafale might have the kinematic advantage but the J-10CE does have a larger radar. But beyond that, the two aircraft are broadly similar enough such that the minutiae of their technological differences won't make a difference if their respective pilots are simply mismatched. Factor in stuff like ECM and AEW and their inherent capabilities begin to matter less and less.Short of J-10CE carrying some secretive super weapon, the Rafale is a better fighter 1 vs 1. PAF likely just has better networked platforms.
Su-57 should be much more capable than J-10C in just about every way.
The thing is the Indians bought Rafale to counter F-16s and JF-17s when they realised their MKIs were not going to give them guaranteed air superiority even in greater numbers. Rafale represented their silver bullet much like F-22 represented USAF's silver bullet of assured superiority back in the naughties. J-10CE purchase by PAF was a counter to the Rafale. To deny IAF guaranteed air superiority. It worked.
Su-57 if purchased would be yet another attempt to gain an overwhelming advantage. It'll bleed Indian economy dry if purchased in significant numbers but it would be something Pakistan cannot financially afford to match short of China donating J-35s.
AMCA isn't going to be inducted this decade and unlikely to be fielded in significant numbers even in the entirety of the next decade, if they even complete that.
India will get a slap in the face for turning back to the Su-57. They are probably hoping for F-35s now but they're quite realistic when it comes to dealing with Americans for anything military. It'll come with more strings attached than alternatives and no guarantee of function during wartime with Pakistan. Basically any potential IAF F-35 would only ever be allowed to be used against China.
I think IAF will double down on Rafale and simply try to improve their network and invest in CCA to supplement Rafale while working on making AMCA a workable next generation solution. There's also the potential route of joining GCAP. They can either have AMCA and a better domestic industry that comes with the AMCA journey or GCAP, not both.
Which is to say that PAF's victory is in large part due to its operational planning, tactics, pilot skill, and also the fact that they specifically targeted the Rafales to maximize the kill probability. If the PAF had operated Rafales and the IAF the J-10C, the IAF would've lost 3 J-10Cs instead.
If I were the IAF, I'd focus money and personnel on the AMCA and maybe the TEDBF. Everything else matters little.