I'm just saying as the original designer/artist I don't give permission, regardless of the MIT license (which I disagree with on CodePen but that's another story).
It doesn't matter what you say here, the license is kind of final for the code it's referencing.
IIRC CodePen does allow you to license your code differently, but it requires a "pro" account.
Judging by the fact you said you won't use it, you seem to have a working moral compass - unfortunately you are a minority.