Pretty much anyone who is presenting peer reviewed scientific studies based on empirical data, but only if they are not pushing a sponsor, book, or some kind of service. Academics with an axe to grind are OK with me as long as they aren't trying to make a living by promoting themselves, products or services.

YouTube has some real gems, but it also has a lot of influencers who will say anything they think their audience will keep coming back for. Those YouTubers make a living off confirming their viewer's biases. You don't need to have anyone telling you are insulin resistant/carb sensitive. You can test it yourself by cutting your net carbs to 20g/day and replacing those calories with healthy fats and protein for a few weeks. Its not easy at first, but its not going to hurt you either. If those carb (sugar) cravings go away you can experiment by slowly increasing net carbs until you find out what your body can tolerate.

When I started keto, I was shocked to find that what I had thought all my life was hunger throughout the day was really my body craving more sugars via carbohydrates. As my insulin spikes went away, so did those sharp, uncontrollable cravings. The real hunger was so minor it was too easy to ignore and found I was having to force myself to eat enough calories each day.

Good luck with your journey.