The short answer is no. Poch has contracted obligations that stipulate the terms of work. There are no release clauses in French football.
The ony thing Poch can do is resign and forfeit the value of his contract within the contracted terms that stipulate resignation period etc. Managers, unlike players, are not counted as tangible assets so the two aren't comparable, even if their contracts both work short term.
I doubt a club like PSG has any type of "if x club comes asking then we release you" clauses, so this will ultimately be up to PSG to decide what they want to do. But given that they said no to 200 million euro from Real Madrid for Mbappe, I don't think they care one bit about a manager buyout. Poch leaves if PSG allows it, or he resigns