Everyone is free to do what you want, but I never would take medical advice from a You Tube channel personality. This is one person’s experience. It is anecdotal and by no means any indication of any sort of “cure.”
As I have mentioned before, I went into a spontaneous remission (after initial standard treatment with prednisone). This lasted over 20 years without any guidance from a health guru. I ate whatever I wanted. That was my experience, also anecdotal. My son also had pancolitis and has been in remission for over 10 years by doing nothing in particular. His experience, anecdotal too.
I am not saying anything against a varied and healthy diet and general fitness, but it is NO CURE for UC!
Jan