We still do.
Honestly what a ridiculous way to introduce the article. Like there's already widespread consensus on there being three types of diabetes.
The cited articles barely prop up the authors assertions.
Seems to me that you, along with some others, are getting a tad overheated. He goes on to say "The idea that Alzheimer’s might be Type 3 diabetes has been around since 2005, but the connection between poor diet and Alzheimer’s is becoming more convincing". A perfectly reasonable statement.
This is a short opinion piece which will alert those interested to look further. If this is not to your liking then check out this one:
which has plenty of references. May be right, may be wrong but it's an interesting idea.
I have Type 1 Diabetes and I "got" it when I was 19. Type 1 means your pancreas has zero capability of producing insulin, Type 2 means your pancreas has reduced ability to regulate or has reduced insulin production capabilities. Maybe he could have said Type 1 is a genetic disorder and Type 2 is generally brought on due to environment or lifestyle.