This seems like a useful and desirable effort to improve the UX. Thank you. I would suggest one of the two things, the latter of the two most likely more manageable and digestible.
- When a post is tagged status-completestatus-completed and there is a reasonable question as to how you got to complete, add a follow up answer. A simple, "change the link to red" would not require follow-up but Does this answer your question duplicate comment text is silly and confusing) would benefit from some explanation (i.e. did you change the original text back, use suggested text, or change the UX in some other way). Just so we know.
- Roll up all the completed items into a single highlighted meta post, e.g. 2024Q2 Community Asks Released or some other title. This is reminiscent of software release notes we're all used to. If there's 5000 items, you can call out highlights like you did in your post and group and simplify the long tail (e.g. "various minor usability improvements").