The HN team originates in April 2014, when I became public as a mod. (That's not early in YC btw.) In that case you're talking about me (and possibly Scott), and while I guess it's dangerous to make strong claims about some meeting I don't remember, there's no way we would have "explained how the ranking algorithms worked" in such a way that you could game HN. That's precisely what we would not have done. I've worked way too hard on that shit to blab about it and see all that sand run through my fingers.
I also doubt that we'd have told you "the best times of day to submit"—people ask us that all the time and the stock answer is we have no idea, there are all sorts of dodgy analyses out there, and you can take your pick.
As for helping you by editing text, or emailing people when their stuff shows up on HN's front page, yes—I do that frequently for YC founders, non-YC founders, and non-founders.