Yes, the rising blood glucose dysregulation, and in the face of "the food advice is fine", is a global phenomenon, indeed.
I know of many instances in my own country, Aotearoa/NZ, of friends, who get prediabetic HBA1c readings, and their docs and medical centres do not inform them. So, no chance to do something about it, before it leads to diabetes proper.
The US has a slightly lower line between healthy and prediabetes, re HBA1c, I believe? Not sure what that means for their docs taking a prediabetes diagnosis seriously.
As for undiagnosed T2D in big numbers. Yeah. Mine went undiagnosed for I don't know how long because I hated having blood tests, to say I was needle shy is an understatement, as I bruise easily, and I was in a country (Mother Sweden) which is a bit heavy handed with large hurting needles. I'd had a couple of tests and had to live with heavy bruising, so I was loathe to have another, and in that time... well... now I'm super used to blood tests, and know all about butterfly needles, and how to ask for them....Sigh.