EDIT: Looks like the parent post entered the second chance pool (https://news.ycombinator.com/item?id=26998308). Not only did all the timestamps get rewritten, but apparently I can now edit this day-old comment :) Interestingly, it does show the correct timestamp when editing. Off-topic, but thought it's interesting behavior worth mentioning.
EDIT: Looks like the parent post entered the second chance pool (https://news.ycombinator.com/item?id=26998308). Not only did all the timestamps get rewritten, but apparently I can now edit this day-old comment :) Interestingly, it does show the correct timestamp when editing. Off-topic, but thought it's interesting behavior worth mentioning.