The thing is, I don't actually think he has any qualifications. You check his website and all it says is that he has 4+ years of experience in calisthenics. It says he's accredited but it doesn't actually say what he's accredited in. His Youtube channel doesn't have anything on it either. Unless he mentions it in one of his videos?
I think that's the problem with the fitness industry as a whole. You get so many people who have been training and working out for years and have become really good at just that. Training and working out. They've figured out what works for them. Unfortunately a lot of these people try to help others even though they have next to no scientific knowledge base to back up their training programs, claims, and/or reasoning for doing things.
To add to that, you get trainers qualified with the absolute minimal qualification of a single certificate (which is really fuckin easy to get by the way. You don't need to be a genius to get one) going ahead and putting themselves up on the pedestal.