Now I’m wondering if human meat would taste different if someone sat around eating popcorn and sour straws vs someone that pumped iron and pounded protein powder? Those super ripped dudes would be super gamey. Even gamier still: vegans. I’d hope he was on a steady diet of red wine and white castle and maybe acorns for a nutty note or two. Umami is a keystone for a proper flavor profile.
Why would vegans be gamier tasting than meat eaters? The logic for high protein body builders tasting bad would be the same for meat eaters. Low protein diet would make for better taste according to your opening argument.