PAF is getting J-10C that part is cleared. Otherwise PAF would have dismissed all the rumors after media reports. But Whether PAF J-10Cs will do the fly past Or the PLAAF jets that's not clear yet. Other country team do participate in such events especially when there is close military relationships. e.g. Turkish team do the solo fly past. I am not saying for sure that it will be chinese team, but the possibility is there. Because time is very less. Its highly unlikely that if PAF jets arrive just before Parade and will participate as well. Remember, Pilots have to practice a lot for these airshows. So I think time is very low unless planes arrive this month or early next month.
BTW! J-10c had participated in 2019 parade as well. see below:
So, I think the only thing that is clear for now is that PAF is getting J-10s But it is not yet clear that whether it will be PAF J-10s or J-10s of chinese aerobatic team in the upcoming parade Or both perhaps a fly past of 4 PAF J-10s followed by this aerobatic team show.