Sicario2 spurs at home - his mistake led to their goal
Man Utd at home - his mistake led to their first goal
Okay, he made mistakes in these games, but that isn't the same as being shit. And as for the "mistake" against Spurs, it's pretty unusual to be punished for taking too long on the ball in central midfield in such a swift and emphatic fashion.
So I'm not denying those goals were his fault (although Saliba's pass v United didn't help), I just don't think that means he was shit. Was he brilliant when he scored against Aston Villa for example?