Still visible to me. Just below the 4 months later message, I see the following:
It’s been a while since we’ve seen Idle_Thoughts — their last post was 3 years ago.
I searched for “It’s been a while since we’ve seen” and there’s no Looking at discourse.org, it seems to be as designed.
These banners are visible to other users, but not the poster they apply to… and by default are only visible to community members who have been active enough to achieve Trust Level 2.
Reading discourse.org, only admins can do a proper search. By looking for, “Welcome back”, I found the 21 year gap.