Sorry, what's the "danger" here? He's still doing press conferences and the Republican party is still actively cancelling members who dare to disagree with him. Folks on Fox, one of the most mainstream media companies, still refer to him as the president. For being deplatformed, he's sure got helluva platform.
Yes, and it's appropriate to address Trump with the same honorific. But referring to him in present tense as "the president" is quite different than addressing him as "Mr. President", and it's the former that raises an eyebrow
Curiously, your link suggests that Trump liked people calling him Mr. Trump even while he was president, where that was seen as passive aggressive when done to Bush II.
