Technically yes, but what impact do they actually have? It's pretty much irrelevant what he says there. Journalists simply like to use it for clicks.
They literally cannot be irrelevant because they're official presidential communications - "The Department of Justice on Monday told a federal district court judge In Washington, D.C. that Donald Trump’s tweets are “official statements of the President of the United States.”"
https://www.abajournal.com/news/article/government_says_trum...
see also just a few months ago. https://www.cnbc.com/2020/05/01/tesla-ceo-elon-musk-says-sto...