The fee of course is ridiculous. That kind of fee is reserved for world class players and high caliber young talent, not for above average to good type of players like Coutinho. He is worth maybe slight more than half of that fee.
Similar players to Coutinho cost in the €40-50M range this summer window alone, like Sane (€50M), Mkhytarian (€45M), mane (€41M), Draxler (€40M) a couple of which I would rate higher than Coutinho.
It would be more stupidity by this board not only to buy a player that is not needed to play a position he cannot play, but to pay such a ridiculously overpriced fee for him.