It's odd to read something that's pretty well-versed with some relatively complex CS concepts, i.e. it's not just a PhD with a blank text editor. But simultaneously, makes egregiously obvious mistakes that I wouldn't expect any college graduate to roll with.
There's a certain type, and I don't know what name to give it, especially because I certainly don't want to give it a condescending name. I call it "data scientist types" when I'm in person with someone who I trust to give me some verbal rope.
Software really feels like it ate everything and everyone. So you end up with insanely bright people who do software engineering as part of their job, but miss some pieces you expect from trad software engineering.