That's true- I even stated that I thought KetoType1 should have put a disclaimer.
At the same time, I do encourage people to take charge of their own health, and to make calculated and appropriate risks. My primary concern was people only reading your name, the word "dangerous", and being put off from further research about keto in general because of that. Some physicians used to recommend rice- and grain-heavy diets for diabetes, so some healthy skepticism (EDIT: in the "trust, but verify" sense) is warranted, even towards one's doctor.
Of course you're not immediately "disqualified" from providing meaningful information if you don't have skin in the game. However, the current state of pretty much any science-related-to-food is woefully inadequate (remember the food pyramid? and how fat was evil and going to kill you? And don't even get me started on carcinogens and meat). At this present moment in time, people who are actually trying and living on keto (, in particular those with diabetes) are actually on the bleeding edge of food science.
I personally have friends who manage Type 1 & 2 diabetes with little-to-no insulin on Keto, and I'd hate to see people being turned away from at least researching a lifestyle that could significantly benefit them because a well-respected member of the community said it was "dangerous" (and often, deferring to doctors can be not helpful for reasons mentioned above - I wish people would at least research for themselves).
I'm not sure why you're being downvoted. I know jacquesm is a very well-respected poster, but unless he's got diabetes himself, he's providing his opinion with absolutely no real-world-experience vs someone who has been managing diabetes with keto for two decades.
Even if keto "isn't for everybody" (and KetoType1 should have put a disclaimer), I'd certainly much rather take advice from someone with skin in the game.
If so, what would make them suggest such a plan in the first place?