That's the traditional meaning, but also commonly used to refer to politicians who are term limited, and can't run again.

https://en.wikipedia.org/wiki/Lame_duck_(politics)#United_St...

A president elected to a second term is sometimes seen as a lame duck from early in the second term, since term limits prevent them from contesting re-election four years later.

He does not believe he can't run again, so it's a doubly inappropriate description.

Trump and Steve Bannon have talked about finding a way to run for a third term.

And who will stop him from running again?

How bad are the economy and midterms going to be? Will Republicans think that supporting a 3rd Trump term will be good for their own reelection prospects?

They turned right around to pick him after the insurrection.

It looks like we are in for a pretty bad time economically. But even so, he is running the party. Wouldn't shock me if he ran again and got nominated.

I'd not be surprised if Republicans supported an illegal 3rd term run, other than the fact that I think they'll save their own reelection prospects first if it comes to that.