I think Sir Frumble's point is that it seems possible and indeed likely that Ornish's approach to nutrition is not as scientifically objective as it should be.

If he practices a religion that forbids meat, and is devoted enough to that religion to be a devotee of a a swami, how could he be objective about the health benefits of a meat based diet?

A true scientist has no bias, and will evaluate ALL of the evidence equally, without pre-conceived conclusions. Does this sound like Ornish to you?