Summation mode for this topic started at 300 messages. Your summation message was apparently during the "summation mode is coming soon" period.
You've now made your message during the summation mode period, and should not be able to post any more messages in this topic.
And apparently admins still get to reply to specific messages during summation mode time. Admins can also post multiple message during summation mode time.
Adminnemooseus
Edited by Adminnemooseus, : Add middle paragraph.
Edited by Adminnemooseus, : Typo, or something like that.
Or something like that.