These are the daily active users as stated in the article.
It sold more than that, based on the charts it's doing in line with FFXVI, so it should be around the 3-3.5m mark.
Still it's clearly lower than the original FF7 Remake hence why they didn't issue any PR.
But there are multiple reasons for that.
Bigger installed base, stay at home vs non covid release period, the negative impact of being a sequel targeting the same fans that actually played and liked the 2020 game has been definetly understimated as a factor and this will get worse for part 3.
Still the game is absolutely fantastic, best RPG of the generation among with BG3 and given also the critical reception it's clear they have found the right template of gameplay and open world exploration for future games.
They have an issue in reaching new audiences beyond their core fans that were introduced to the series during the PS1 age, but this is unfortunately for them an aging demographic.