There happen to be a lot of people around who spend an hour on the internet and think they know a lot physics, but it doesn’t work like that. There’s a reason there are graduate schools in these departments.
Chomsky tells a willing audience the thermite paper by Harrit et al is worthless, and there’s “overwhelming” evidence Bush did not know about the attacks in advance. This is a similar position to that taken up by another respected critic, who regularly “speaks truth to power”, Robert Parry. Many find this approach persuasive and reality-based. Other find it cowardly or disturbing in its uncritical echoing of mainstream views.