I'm just going by the official numbers. But even if they've paid, say, 100M euro, it's still 60M too much. Felix is just not the type of player you spend big money for and make your main man. He is a slightly above average player overall, but not really outstanding in anything. This is compounded by his inconsistency. So, you have a player who is good but not really exceptional at anything, without a clearly defined role, without a demanding presence, and is also inconsistent. I'm sure his time under Simeone has had an effect on his development, but it's just can't be all that. Compare this to someone like Bruno Fernandes. Outstanding creativity, work rate, and presence on the pitch. Even a bad Bruno game involves a lot of running and trying.
Felix is a good player to give a punt for 40-50M euro and see what comes out of it. We don't have the money to experiment however, so hard pass from me. And he will never be available for that price anyway.