This is a completely fair question.
Im going to try and answer this question how i see it, without it being a "BigToms Coaching Service" advert, as I am not taking clients from meso currently. I dont want this to be construed as such.
there are two sides to the qualified coaching spectrum.
The experience side, and the educated side.
One is your guy that has learned what works through trial and error over the years and might not fully understand some mechanisms, but doesnt really need to since they have first hand experience.
The educated side are your "Science based" guys, they understand the mechanisms and the literature. They understand the main drivers of hypertrophy and how to incorporate them, they understand the digestion and nutrition aspects from their effort to expand their understanding and knowledge, but might not have had decades of slinging weight around to know first hand.
I see myself as being in the middle somewhere. I have been training at a high level for over a decade and working training and nutrition plans for clients at some capacity for 4-5 years now, on top of that i am myself an active competitor. So that covers a bit on the experience side.
On the educated side, its simply in my nature to expand my understanding of things that interest me. that has led to years of furthering my education and knowledgebase on the subjects of training, nutrition, and enhancement. This continues perpetually, im very often learning things that i either did not know initially or was mistaken about initially.
I personally do not have the raw experience of someone who has been coaching since the 90s, and i dont have the raw education of some of our more esteemed academics like
@GreenAmine @Type-IIx ect. I have a bit of both that i believe work to keep each side in check.
As for our subject of why IFBB pros are not, by default, qualified to coach is because they are pros because of their discipline, and their genetics, neither of which translates into a transferable knowledge or experience base in all situations.
OP's coach is a perfect example.
Clearly works his ass off and has the genetics to become a pro, but has objectively wrong information in his plan thats rooted in a fundamental misunderstanding of what that medication does.