Carlos mentioned both the workout guy and Mahomes saying he needed it. I wasn't sure which "him" you were asking about.
Also, from the workout guy...
“I don't need him to look like a model because the way he chooses to play requires a certain type of physicality, and that physicality needs more body fat. That is a core belief that I do have for him.”
https://atozsports.com/nfl/kansas-city-chiefs-news/chiefs-patrick-mahomes-trainer-bobby-stroupe-reveals-purpose-behind-mvps-dad-bod/#:~:text=%E2%80%9CWe%20know%20there's%20just%20not,career%20last%20a%20long%20time.%E2%80%9D