The information appeared on the Taiwan classification website.
Judging by the fact that September 10 is Tuesday, this is not a stub. Moreover, they are usually not put on the classification sites.
Potential box-art of the game is also taken from the page on the site – the Span ish edition of the Generacion Xbox initially drew
If the date is correct, then Gears 5 will have to compete with Borderlands 3, which is scheduled for release on September 13th.
Probably, the accuracy of information will probably be known in early June at the Microsoft conference during E3.