Does the name ‘Donald Trump’ ring a bell?

Is he still using twitter?

Also: https://www.donaldjtrump.com/ (which includes a news section)

No but for a time it was his primary news distribution platform, which means it’s reasonable for some other important person to also use it as their platform.

Except for sharing his mug shot, even he hasn't posted on Twitter since Biden's inauguration.

I’m responding to the parents ‘ I don't believe that anyone but Elon Musk use twitter as its only communicatuon platform.’ - at some point trump did use Twitter as his primary communication platform, whether he still does or not is largely irrelevant to the point.

what is important is that you changed the goal post.

I said "only" and you moved it to "primary".

Primary meaning first and possibly only - I really don’t know if trump had secondary platforms, but people would talk about his Twitter, not his blog.

Proving it to be his only source is likely impossible to do, but also has little value (do you want to learn the latest news now or in a weeks time when secondary sources catch up?)

And to follow up, my understanding is that trump would post personally, not one of his PR staff, I’m not aware of him personally posting elsewhere until after he was banned from Twitter.

That's present tense though. It was more popular in the past, but today, it's been relegated.