If you can catch posts you think are unfairly flagged as they happen you can also send them to hn@ycombinator.com. Even if it's a day late they can unflag it, second chance it, and/or watch the comments.
The mods hold a strong opinion that making the moderation log public in some way (so these kinds of things can be seen directly) would cause more problems and discontent than it would solve. I strongly disagree, but I respect that the mods have always delivered satisfactory answers for me when using the emailing process - which is their main counterpoint to the need for a public log.
We're talking about the same site that constantly has submissions from politically biased sources alluding to various ways that the orange man is bad, where comments pushing standard right-wing talking points are frequently flagged and killed within minutes, and a recent Ask HN seriously entertained the question of whether HN is "fascist" (>>44598731 ) because the "orange man is bad" posts get flagged?
Another shameless note that this is the kind of thing I think a public moderation log would really help.