A bit of selective quoting.
If you read the full interview at some point it says:
It was the pain killers and other crap that was killing him. Here is the real story.
Marius was hooked on all the crap he was taking, and when he met George it was time to quit all that nonsense. Get serious about bodybuilding or fucking quit. So, Marius found God. If you notice, many recovering addicts speak the same way, they 'give' themselves to God, and suddenly it's God everything, every day. This sounds about right.
The whole " i am healthier working with george than palumbo" is easily just a bit of you scratch my back i scratch yours. Make the old trainer look bad, new trainer look good etc. Nothing to see there really.
There you have it folks.