It is possible that the other person used auto-buy in which case they are excluded from participating in the "first to buy" achievement.It is also possible under some circumstances to post a comment on the card while it is in the store and pre-release. I am one of the QA team and I have that capability.
Thanks
@pickle1, I noticed its the same person FatLegDeer0113 commenting on the cards before usual time of release. For almost any recent card that I opened to check, noticed that his first comment is showing up, later on, other people also commented but only after 10. Once the day is over we can't see the time (it only shows yesterday or 2 days ago), but on the same day it shows how manys hours ago, there I noticed. Not sure if he is a moderator or not. Showing as a Triple Diamond member on the profile.
It may not be much of a big of a deal for many, but just being a fan of iStripper and achieved quite a few achievements so far I was checking which all are low hanging fruits that I can give a shot. Noticed this first time buyer is still pending, so tried on different days as soon as it got 10 AM Paris time, I noticed the cards became available for me, and I clicked on purchase. Since I have one click purchase activated, added in no time, but still the achievement is not attained.
Now it might also happen that within a split of few seconds around 10 someone else was coincidentally trying to make a purchase and just got lucky. But then it feels weird as it's not just once, but every single day one person is able to rate/comment on a new card 3 hours before available for purchase. Till here nothing wrong in it at all unless there is a glitch in the Software of any kind.