Earlier quoted context omitted.
Correcting grammar and spelling errors—especially in public—is always a tough call: upon judging that an error is systematic and not a simple typo, do you help the writer avoid the error in perpetuity—even if it embarrasses them a little, and even if you'll probably get downvoted for being pedantic or offtopic? In this case, I've determined the downsides are worth the possibility of sparing the author a lifetime of e…
The author's email address is in his HN profile (one click away). If you truely wanted to help the author you could have done it in private. I agree with the other users who replied.
By the way, despite logic, "truly" doesn't contain the substring "true", so "truely" is a misspelling. Your email address, unfortunately, isn't in your profile (and nor could I find it via opencagedata.com), so I hope (though doubt) you'll forgive a public correction.