I was wondering the same thing.
This isn't super clear from the website. On the first link, it states: "When you earn 10 or more A+ credits flying AirTran Airways within any 90-day period..."
To me, I would think the 1.5 credits are earned flying AirTran and thus would count towards the count.
Too bad if this isn't the case...
They really should explain the difference between an actual flight credit and a bonus credit, I agree.
That's why savvy folks like yourself use FT though.