My assumption is that the OP, "geerlingguy", and the post's actual author Jeff Geerling, are one and the same. Not unreasonable, I think. If he wants to post his work on HN and not read the discussion (which is obviously going to be relevant to his work), that's on him.
Grandparent's point wasn't that the author may not be reading, but that HN is better when comments benefit everyone here.
This isn't a hard and fast rule; I've certainly done my share of 1:1 conversations on HN. But for typos my usual approach is to go look at the author's profile, maybe click through to his website. Sometimes I'll even `git clone` a repo just to harvest an email address ;)
Just my 2 cents. You can keep reporting typos here as well. I'm sure authors would rather get bug reports somehow than not at all. Certainly not the most egregious thing one will see here on any given day.