Sorry, Petrows, you just aren't familiar with the diversity and richness of the English language.

The OED defines the sense this way: "To discourse about, speak of, discuss." In this case, "to talk Trump" means to speak of Trump, to discuss Trump.  Trump is a topic of discussion these days, in all his dimensions. 

(You might notice that the word "about" is already in the OED definition of the word "talk" in this sense.)

I'd also ask you not to flag this comment as well, since we are the only two people reading them.