In fact, this was totally and easily explicable after the dominant political party tried to convince Americans that their current leader was not suffering from severe cognitive decline and was "sharp as a tack" (a Biden admin talking point) and that NPCs lying to Americans about Trump being "easy to beat" by Kamala and also lying to them about Trump calling Charlottesville protestors "very fine people" and thinking that those fake attempts to make Trump look like he was endorsing Nazis wouldn't backfire explosively.
So, no, it was not "inexplicable" at all but it was rather Whiplash Effect initiated by media narratives originating in the Democrat ecosystem. And don't forget: Trump, Elon and Rogan are all ex-Democrats. I wonder, too, if the author was one of those people who deluded himself into thinking "Kamala is a great candidate" against all the evidence.
So the "Russiagate" hoax failed, "Kamala is awesome" failed, elites orienting themselves around appeasing far left pressure groups failed, smug contempt for middle America failed (astonishingly) and yet it is "inexplicable" why Orange Man Bad won the election!