The Wikipedia link you provide here for copyleft does not say that permissive licenses are a subset of copyleft licenses, but rather contrasts the two categories. For example, you can scroll down to the table at “Types and relation to other licenses,” where you can see MIT is not in the green Copyleft column.

If you check Wikipedia’s Copyleft software licenses category, you’ll see MIT is absent.

The Wikipedia link you provide for permissive states:

The Open Source Initiative defines a permissive software license as a "non-copyleft license . . .