If you Post the Link to this Lemmy page you get now this on reddit.
So whenever you make a comment with the Lemmy page of this here you get this as warning now maybe Reddit goes now full censorship? wanted to post this https://i.imgur.com/9dily6R.png
Are you sure it just isnt a warning specific to that subreddit for other reasons? They do have rules against certain types of links so I could see there being a reminder popping up when any link is detected.
Though tbh, not our problem anymore, good riddance