Use archive.is and it will show if the post was removed. I found out purely by accident on Friday last week.
https://archive.is/mEw4d
Discovered How to Check If Your Reddit Post Was Removed
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Re: Discovered How to Check If Your Reddit Post Was Removed
#2I think you want something like this instead:
https://www.hongkiat.com/blog/read-reddit-deleted-comments/
There are services that track deleted comments.