This match is again gone from fifa.com. However it seems it will remain "A" for FSF.
That doesn't mean anything except:
1) - doesn't know that Thailand used their U-23 team
2) - doesn't want to admit that they lost 2-0 to an U-23 national team
3) - doesn't know that FIFA have removed the match from their list (after FIFA originally being so sure that it was an "A" match).
Number 3 is quite likely - how many people know that this match was removed?
As for the facts, we all know that it was a match between an official 'A' team and an official U-23 team preparing for an official U-23 event. Let FIFA or the FSF consider it how they wish. The fact remains the same.