Yes, I'm not sure where El Reg gets that from, as if you read the abstract the identification of a hypoglycemic event seems to be based on ECG changes, not heart rate, in particular a prolonged QT interval, an increase in the R/T amplitude and a raised S/T segment.
Unfortunately all of those can also be a consequence of Ischemic Heart Disease, and a high proportion of Type 1 and 2 Diabetics will also suffer from IHD.
I don't see how you could reliably differentiate between the two without careful calibration for each individual patient.
