Source for this? My understanding is that the link between non-caloric artificial sweeteners (NAS) and diabetes is growing increasingly clear. For instance:
NAS linked to glucose intolerance (pre-diabetic hyperglacemia): https://www.nature.com/articles/nature13793
NAS unlikely to be healthy alternative to sugar for prevention of type 2 diabetes: http://www.bmj.com/content/351/bmj.h3576.full