As long as you are selling and buying at the same time you are still within the FFF rules and that's what PSG does, they release players or make sales every season to stay within the limit, there are so many players leaving this season because of the incoming ones.
Not correct, is not only the market counts for the FFP. They need to count everything.
For example, PSG in 2020 was losing over 200m€ for COVID like any other big club but they are the only club who spent already 70m and increased salary by 100m ish.
The radio for salaries over team balance should be under 70%, PSG were already at 74% before the increased salary for Neymar, Navas, Donnarumma, Ramos and the other they got.