I know what you mean and it's a puzzle that continues to find me struggling to wrap my mind the behavior. Even though the science of this, these, behaviors continues to replicate in study after study after study that the intellect is frequently not a factor in any way/shape/form. That the native inbuilt human urge to believe colors & complicates the intellect's processing choices. And more than I'm comfortable with compromises the intellect's processing choices. I look around myself in Real Time and see this everywhere. Matters of the heart, matters of ideology, matters of political leanings, matters of right/wrong definitions.... and on down the line to the most mundane and innocuous opinions on things like the Kelvin Timeline and the 'Voyager' series.
And, yes, I do agree that he displays a lack of understanding and uses rhetoric. I also observe that he believes. And belief can be interpretative by even a high intellect as evidence of truth. A deep seated belief rejects contradiction, even observable facts, often re-framing contradictions in held belief and even facts that contradict belief as 'assault'.
I submit that the writer is not intellectually limited in any way though. That it is a belief system playing out in his writing, and that everything he writes seems perfectly logical to him.