asfgisroshnio
"Many vegans think it is vegan."
"No true vegan would think that, therefore, they aren't vegans."
No True Scotsman is about a particular form of reasoning, not any sentence that includes the word "true". It's a form of ad-hoc rationalization where someone rejects counterexamples out of hand. ramraj07 wasn't really making a generalization, and the rejection of the "counterexample" was neither ad-hoc nor unjustified. Many people outside the U.S. have always viewed American liberals as right-wing, and this is justified because American politics actually are right-wing compared to much of the world.
It's not "easy to miss". The author beats you 'bout the head with his ideology. It's heavy-handed even for something explicitly didactic.
The first few chapters of HPMoR are fine, I suppose. It's pretty lighthearted. But it rapidly devolves into unhinged ranting at extreme length. The last five hundred thousand pages are a vehicle for the "wisdom" of one of the most insufferable, unjustifiably arrogant, and misinformed people to ever draw breath.
Just go read Elon Musk's Twitter feed and watch some of Terry Davis's videos. Same experience, whole lot shorter.