You’re correct.
Washington DC becoming a State, is unconstitutional and can’t happen without an Amendment to that document.
I agree but Democrats will try anyway.
It requires the consent of Maryland (a certainty), application by a Statehood convention in DC (not by the existing DC “government”, which is unconstitutional), and approval by Congress, which is probable but not a certainty.
Removing the three electoral votes granted to Congress by Amendment XXIII requires a constitutional amendment (repeal of XXIII), but Congress will never pass such an Amendment (why would they?), So New Columbia + DC will have six EV.
What makes it unconstitutional?