It can go back as far as all 13 years if it needs too. That spreadsheet is not what our updates are based upon.
Its a good indication for the general timeframe of when updates can fall (but then again that period window is hardly difficult to tell without it), but it has no relation to the current major or any future majors development cycle or release date.
Majors have and always will move around +/- dates. The same with blogs.
The fact the current majors blogs (or the next) dont line up with the previous year(s) doesn’t mean the current major is “late”, “early” or otherwise.
Gaijin needs regular updates to keep the game alive same as all other live service games
saying “oh you dont know if an when an update comes” or “these times are not what our updates are based around” after 7+ years of regular updates at or around the same time of the year can only be characterized as bad faith