That is a video editor much like Adobe Premier or Final Cut Pro, so would not be a replacement for AE. After Effects is essentially Photoshop but with motion and animation. It’s mostly for VFX and Motion Graphics. Not video editing or audio.

I think it’s likely:

1. someone posted something that later gets banned
2. in between the posting and the banning, you upvoted it
3. at time of banning/removal or after, they can check the logs of users who upvoted it while it was “live”

Also on reddit, removed posts and comments by subreddit mods can still be viewed if you have a direct link to it, or if you find it from a user’s profile instead of from the subreddit it was posted in. From there you may be able to vote on it still, although it’s pointless in most instances. However, Admin removed stuff likely cannot be found in the same way. Also a user deleting their own post or comment cannot be viewed in the same way either.