If the transcript I’ve seen floating around is accurate, the phrase “this was fairly trivial” absolutely was about how difficult it was to pull off. The lines above and below it talk about super basic social engineering that anyone could do and the hard part of the tool engineering has already been done.
That doesn’t exactly equate to constantly writing well. I’ve met many engineers and scientists (computer or otherwise) who couldn’t give 2 shits about proper English unless it was specifically for a grade, sending to clients, or publication.
Educated doesn’t mean that you stop writing informally. It just means you’re able to write formally.