Yep. Forum is incorrect. Originally it was a level 10 capstone feat for remaining pure class. Then we implemented the pure class only store. I'll update the forums.
I ran a test pc up to level 10 to confirm that the fighters are receiving the bonus feat at level 7 and level 9 are working.
4 general feats. (1, 3, 6, 9)
1 human general feat (1)
6 bonus fighter feats (1, 2, 4, 6, 8, 10)
3 2 bonus class CoA fighter feats (7, 9, 10)
Total feats s/b 13. Grab a DM to confirm your pc or double check your count but this was also confirmed looking at player pc at level 10 and they have 13.
Cheers