Sure, this use of "cringe" in the adjective position is Gen-Z (I guess) and in a way itself "cringe". But overall I found the sentence to be (while clearly a run-on) perfectly readable.

Saying the president of El Salvador is ‘cringe’ is so low effort it’s insulting.

So you're reading a would-be BuzzFeed clone site called "Futurism" and you're surprised to find your intelligence insulted?