No it's not healthy.
You're right, it only took eating 7-10k (clean) cals per day. Waking up all hours of the night to eat. Training 1-2 x per day 5-6 days per week. Spending about 1.5-2 hours in the gym in the off season and about 2-3 hours per day pre contest. I would guess they also spend about 200-300/wk just in meat alone. They also hold down a job, families and hobbies. Mind you it doesnt happen over night, 8-10 years of hard training and you have a very SLIM chance of making it anywhere in the sport.
Nope, didnt take much dedication at all.