Need I say more?

If I read this correctly, diabetes is listed as a disability. Well, diabetes is rampant across the US, but if well controlled shouldn't be a disabling factor. Type I diabetes is different and can be 'brittle" if not well controlled. I know firsthand about Type II diabetes. Mine is in remission (normal blood glucose) as I had weight loss surgery (huge weight loss as well) last December.
However, my obstructive sleep apnea has not been resolved; but has greatly improved. I do travel with an auto CPAP. Do I have a qualifying disability or hardship? I'm just curious in case I come across an IDB situation.

I believe that's correct, diabetes is technically listed as a disability.

Funny thing is as a Type 1 for 44 years, I don't consider it a disability at all :D An annoyance at times, sure, and carrying around the pump supplies can be a bit of a pain when flying (especially planning for extras in case of delays, etc.), but it isn't really a disability.

Diabetes is listed as an "impairment." An impairment is not a disability unless it "substantially limits one or more major life activities" (as defined in subsection (b) of the quoted regulation). So diabetes may be, but is not necessarily, a disability.