This current activity system was in place last Christmas. In addition, 1500 is more than enough activity to be a Hero Member. You must have gotten dates mixed up somewhere.
The dates are correct. I don't remember exactly how many posts I had but it was a lot cause many people were commenting on it.
I think the old system also had a time variable - where you had to be logged on for a certain number of hours and unlike now, it took a long time to accrue just 1 single day. So maybe I wasn't hero yet due to the time constraint which took a while to accumulate.
I don't remember exactly but I am certain I was Senior level and was very close to HERO cause I was looking forward to it and I am also certain I lost it all just cause I went on vacation.
And if you look at my post history from the beginning, I was not posting 2 word spam posts, I was simply very active. I posted long hours everyday just to have it taken away without any warning.
I should easily be a legendary member now yet I'm still not even a hero member.