As Risky pointed out...don't take it too seriously...especially if you are/have been an active member. Everyone (including myself) gets that Notice if we don't post at least one msg within a 14 day period.
The site will automatically move an account after 60 days of inactivity to an inactive group. It does not delete the account. If the inactive account logs back on, then within 24hrs, it is auto-moved back to active status.
I do prune accounts...thus why you see approx. 5K accounts. This site has had well over 10K since it started.
So relax and don't worry but please don't post just any crap to maintain the 14 day window.
tom