Without much knowledge i think it’s safe to assume he is never worth that much, but it’s obviously the EPL market for english players that is total bs in their evaluations so nothing surprising here i guess.
Yup i imagine they must have good reasons to move for him, it's just the absurdly high transfer fee that is laughable, from the highlights he actually seems to be a decent/ok player but not really much more than that... if he was any other nationality or league he probably would have been transferred for about half of what City is paying now.