I have a few old posts on the subreddit and i need to view one of them as i am reviving an old project. there is a comment on one of them that has the info i need. I never screenshotted that info.
The sub is currently available in Restricted mode so all posts can be viewed but new ones cannot be submitted. The sub is currently polling subredditors for their vote on whether to stay open or go dark again. Check your post while you can!
The Internet corollary to Murphy's Law: If you post something, it's public forever unless you need it later, then it'll have link-rotted. Anything you want to delete will be archived, anything you want to save will be deleted.
Make a GDPR request for all of your data. If they still have it, it'll be part of the dump. Expect to wait the full 30 days they're allowed before they give it to you.
Here's a quick way: become a scab mod for reddit. Get your thread and while you're at it scrape the sub to archive it, then lock it down again. They are reopening subs whenever they find replacement mods right now. I don't know if they would rely on you alone but chances are high.