Thick Thighs Save Lives
NeoGAF's Physical Games Advocate Extraordinaire

Looks like this sales update was 'hidden' in the June 8 press release when Square Enix announced the FF16 and FF7R ports for Xbox.
First released in 1997 on the PlayStation® computer entertainment system, FINAL FANTASY VII celebrated its 25th Anniversary in 2022. The game is universally regarded as a hallmark title of the RPG genre. The original title received high praise for its epic storyline, unique characters, and movie sequences that utilized the most cutting-edge technology of the time. Since then, the game revolving around iconic hero, Cloud Strife and his pursuit of the antagonist Sephiroth has sold over 15.1 million copies worldwide and continues to receive widespread acclaim from critics and fans around the world. The popular game has even expanded into spin-offs, films and merchandise.
Source - Square Enix