Why would it be? I can't think of a single airline that would offer financial compensation when one of their lounges is closed and you have to use another, and as mentioned by fellow posters I have no doubt that AF will organise specific and very high quality services for P passengers.

I think that if you paid for the upgrade and are unhappy, you can probably ask to cancel that upgrade and get the fee refunded. You may also be able to change your flight to a date that would have the lounge operational if you want.

If not, AF may give you some a few miles for compensation or onboard duty free voucher (in both cases they'll likely do that automatically if that's the policy) as a gesture of good will but hardly more than that.