Perhaps if your read the exchange maybe you'd understand the context.
That fella said that he hopes that Conte and Kane leaves and the club implodes, if that were to happen that's the very definition of mediocrity.
Where we are now with Conte and Kane and we'll positioned in the league isn't a mediocre situation aka we still have some hope.
Now unless you want to argue with the semantics of the word mediocre be my guest but I live in a world of nuance not extremes and don't need to use extreme vocab to get such a basic point across.
Jesus wept