I have just being getting some travel insurance quotes and they also ask about cholesterol if, like me, you are a diet controlled Type 2. I assume that, rightly or wrongly, they think the combination of diabetes and raised cholesterol presents more of a risk even though historical.
Some of the questions are certainly confusing. My wife was advised to maintain a lower than normal blood pressure after a heart attack, so she answers "Do you take blood pressure reducing medication" - Yes, Have you ever had high blood pressure - No.
If you haven't already done so already, I suggest trying the comparison site
https://www.medicaltravelcompared.co.uk/ although they will still ask you the cholesterol question.