Uh, that's 4 times for the month, so once/week = 4 transactions
*hides in the corner*
I actually realised that in the shower this morning and thought "i'm an idiot"
I also got the 10k/December card (and have been confirmed as being on the 10T/5K Uncapped promo by AMEX on Monday, with no points to have hit at all yet).