I would say a darn sight more research is needed. Mainly into how insulin resistance factors in.
And more understanding about D complications, since they are not ALL to do with blood circulation.
And how long these protective benefits are expected to last...
Also (putting on the Pedant Hat) at no point in this post is it explained what 'just one interval training session' means.
One session today, and my chance of developing T2 is reduced for the rest of my life?
or, one session a week?
or, one session a day? with a protective benefit lasting til next Thursday?
or...?
Common sense suggests it isn't the first option, but since since the article doesn't specify, I am sure there will be someone out there who decides they can do a single session and then expect to never get complications for the next 50 years. (removing Pedant Hat)