Unknown? What do you mean?
Mbappe issues already spread anytime since the previous season. Although Real Madrid failed to sign him in the previous transfer window, it doesn't mean that Mbappe has no chance to move to Real Madrid. Moreover, Real Madrid still prioritizes Mbappe as their main target, meanwhile Mbappe still dreams to join Real Madrid. So, public (all people) must understand that Real Madrid has a good chance to sign him.
Mbappe mustn't renew his contract with PSG. If he extends his contract, he may play forever with PSG. I actually don't understand why PSG too relies on Mbappe for their attacking line. I think PSG will be better to sell him and get huge funds, then PSG can buy another top striker for their attacking line. PSG also can lower the salary for the new striker, it is probably lower that Mbappe's salary.
Maybe our friend didn't read the news or didn't see the transfer market process in the previous season, where Mbappe was almost certain to play for Real Madrid, but because PSG offered him a large salary, the deal ended. Mbappe has been linked with Real Madrid in previous seasons and the media has written a lot of news about it to the point where it has become quite talked about. I also saw some of the latest news from PSG where they will try to keep Mbappe from leaving to another club and they have taken an emotional approach with the players.
The drama about Mbappe is talked about endlessly and it will continue to be news that is quite shocking to the world. The presence of Luis Enrique as coach may be the reason why Mbappe is trying to be retained because the coach likes Mbappe's playing style. But that is not strong enough to break Mbappe's reasons for wanting to leave in the current transfer market.