I am glad to see that they do not ignore the Titleist irons in non-release years as they are still available as "new" purchases to people trying to pick up a new set. I agree with you, the categories can be misleading, especially in these days of blended sets. I would say the T400 was a super game improvement iron and the T350 and T200 both could be characterized as just game improvement irons. Fortunately more players these days understand the value of a proper fitting and pay less attention to these stereotypical categories.

The first answer is Titleist doesn’t upgrade yearly. So these are current models.
On the second question, I agree the T350 should be a game improvement iron. The T400 is a better example of a super game improvement iron.

They are still the latest Titleist irons until the 2025 models come out this summer/fall. T350 is as game improvement as Titleist gets but I still wouldn't put them in super game improvement category.