I don't think the engineer in the OP did a good job. They were the last link in the knowledge chain. It's on them to pass the knowledge along and onboard the newbies.
I find it weird that you’re blaming the Engineer and not the managers or culture. Isn’t it on them to make sure that knowledge is passed as well? “I thought everybody was dumb but it turns out they saw the same things in weird ways!”
I see superiority but ignorance? If anything, author is admitting ignorance here. Re-reading some parts and looking at other quotes, they're definitely coming across as arrogant. Everyone is entitled to their opinion, but said opinions can still be ignorant and arrogant.
I agree, my issue was that parent comment felt like an Ad hominem attack. Looking at rest of the discussion, I can see how a lot of the essay is insensitive. And it's a little bit of self promotion as well (author submitting their own article).