@Redapples81 I think all kids suffered during lockdown. The differences are probably more around the time and ability of parents had to work with their kids. My kids were in preps but myself and DH were both working full time (to pay for the preps) and didn't have the capacity to keep on top of school work. It was a horrific experience which I hope never to repeat.
I agree with others that the comments being made by schools on the cohort being strong are standard lines used every year. Some schools might have strong cohorts but I doubt all do. The challenge for our DC as I understand it is more around the volume of applications.