Wars start from smaller conflicts, which come about through escalation of smaller conflicts, lies, or misunderstandings. I think all that is necessary to start a war is a geopolitical event of sufficient severity to provoke a retaliation; once the first retaliation happens, there is high risk of further escalation.

So the question is whether a deception on Twitter could trigger a real-world event significant enough to provoke a retaliation. It might be hard to do that with a single message, but they had access to multiple accounts. These tweets were stupidly obvious scams. You could create a huge amount of panic with a series of posts from different influential accounts if they were designed to be believable.