I think that your doctor may have been quoting the
Action to Control Cardiovascular Risk in Diabetes (ACCORD) diabetes trial, which involves T1's and T2's with cardiovascular disease. I have heard this argument before. Here is the best
link that I can find and here is the
ACCORD web link.
I don't pay much attention to doctors and endocrinologists that quote the out dated ADA guidelines, either, just for the record.