Your scenario is valid, but it is not taking into account Indian S-400/S-500. Now you have an intact IAF turning up in massive numbers hurling BVRs, while LRSAMs have been moved closer to the border. IAF can stay behind the SAMs and harass you. You need supersonic and hypersonic missiles to quickly strike them out. Fighter jets will not give you a fast turnaround when loaded with 2000+ kg missiles.
And again, all of this presumes there are enough fighters, runways, and infrastructure left after the first saturation attack. The IAF didn't just take out fighters on the ground, it destroyed your runways, ammo dumps, forward radars, command and control systems. You will quickly find out that you are in no shape to fight. It would be disingenuous for IAF to do anything less than this. Why would it initiate hostilities, only to leave enough of PAF to fight back?