Valid, but there’s a case to be made that no, he actually is that stupid. A normal person, before making that claim, would verify when the invasion of Ukraine started and when the Nord Stream pipeline was blown up. Tim Pool, on the other hand, personifies the right wing hate of fact checking. He’s basically a more linguistically coherent Trump; he just says whatever he wants to make his story work, and he doesn’t care what the facts are. He knows his audience won’t fact check what he says.
And that could mean that he knew that the Nord Stream pipeline bombing happened after the invasion, but it could just as easily be that he remembered that the pipeline was bombed but not when or why, and it helps his story to say it was before the invasion.