No, for assistance to an enemy to be treasonable, war must actually have been declared, and only Congress can declare war. Actually waging war on the US is treasonable without a Congressional declaration, but the definition depends on a state of "open war" in which you're part of a recognized assembled group of people engaged in open armed hostilities. The short answer to almost all these kinds of questions is "it's…
1) You're assuming this ONLY discusses the possibility of the US declaring war via tweet. The article clearly talks about ANY country that could declare war via tweet. 2) It specifically addresses the question of the US and Congress. https://abe-winter.github.io/2019/10/18/tweason.html#can-a-t...
Even John Walker Lindh couldn't be charged with treason, and he had the weight of an actual AUMF against him.