Yes, as dzaima wrote, the displayed timestamps on comments are adjusted if a submission has grace time added, which happens when we put a story in the second chance pool [1]. This is because the time-since-posting is a signifiant factor in the gravity calculation that pulls a submission's ranking down over time.

I know it's confusing, but if we left all the comment timestamps as seeming much older than the submission, then it would be even more confusing to other readers. (That said, I generally try to avoid doing this, given the confusion it causes).

[1] https://news.ycombinator.com/item?id=26998308

The timestamps just get moved around sometimes: https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...