I’m not sure 1K Voice should be used as a final say-so on front cabin policy. I think what is published is (paraphrasing) “only one alcoholic beverage may be purchased at a time”, which applies to the coach cabin. I’ll go with the idea the 1K Voice response is conflating policy and the doubles being served up front aren’t transgressions. The FA in the OP’s initial post may have also been parroting the coach purchase restriction.

it’s been 2 1/2 weeks since my last flight, but got 2 vodkas with my Bloody Mary mix, which is closer to the right ratio (booze-to-mixer) than not.