The economic crisis that Barcelona is currently facing forces them to bring in free transfer players, that is the only alternative that Barcelona can take in order to maintain their finances. Signing Mbappe is definitely impossible, these rumors can never come true. Barcelona of course really want to have a player like Mbappe, but difficult financial conditions have kept Barcelona silent without making any breakthroughs in the conditions that are befalling Mbappe at PSG.
Imo, Real Madrid silence indicates that they have reached an internal agreement with Mbappe side, Mbappe attitude of not wanting to extend his contract with PSG has a relationship with Real Madrid silence. Real Madrid prefers to bring in Mbappe for free rather than having to spend money to make up for Mbappe very expensive release clause.
It is true that Mbappe is not included in their target striker list because Barca are self-aware of their financial condition, this is just news that seems to be delusional. Mbappe on the other hand, will not leave for free and PSG will not let that happen. Clubs that want the services of the French striker must spend the amount set by PSG management. If any club dares to offer the right price then Mbappe will be at Lego this summer, perhaps AL Hilal will be successful in signing him. If the scenario works then Real Madrid will bite their fingers for the second time, after some time ago they failed to recruit Mbappe.
But I don't think Mbappe will go to the SPL, even if he gets a fantastic contract and salary. Playing in Europe will give him several prestigious trophies such as the Champions League, you can try the SPL if you are aged 30+.