Nonsense, all his performances at WC and his double tie against PSG we're top class, if it wasn't for him it's extremely likely Argentina wouldn't even get past the group stages.
Meanwhile Mount needs a better team around him to be relevant and even when he does have one like England, he was one of the worst players on field against USA, no wonder he was dropped on the bench for the rest of the tournament.
Again I don't hate him, he has his uses in the team but for 300k or anything near this figure, it's just another lame board decision. Luckily for you and most who blindness love him, it's likely the club will give in and make him one of the best earners at this team despite not deserving it.