"Turbo program benefits apply"/"「加倍加賞」積分計劃獎賞適 用" can mean both you get an additional point per $1 overseas/6 airline/TA spending, or has already been applied in the "total of 3 Membership Rewards points".
I'll wait for you to report back on this one
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"i take it as airlines&foreign will earn 6 MR/dollar"
Definitely not, as (footnotes):
"Transaction made at designated airlines in foreign currency can only earn a total of 3 Membership Rewards points."/"海外簽賬購買指定航空公司機票的外幣消費只可獲享3美國運通積分。"
Even second CS read this clause back to me and say there will be *no* 6 points per $3 (we were merely haggling whether it was 4 points or 3 points).