The full explanation would be 30 or more posts in at least 3 different activity periods.
Thx for that keyword 'activity period' - I could find out more:
Next activity period starts only in ~2 weeks: August 2nd 2016 15:00 == 1470150000,
and again whenever (epochtime % 1210000 == 0),
table,
explanations.
So patience is what is most needed now.