Well put.I would add to this that as a physiologist, and a general biologist, Peat studies how the body works.
When he studies hormones and nutrition, he isn't taking notes and saying "eating sprouts will extend the body's lifespan by 50 years whereas eating fruit will extend it by 100 years". He's studying how the machinery of our body works, and realizing that if it gets certain foods/supplements/hormones/chemicals it can run dramatically longer, and longer still as our understanding and synthesis of foodstuffs/supplements develops over time. This approach naturally lends itself to results that dramatically extend our lifespan.
Read his books -- he's talking about delaying puberty and extending the physical and mental characteristics of current childhood. He's talking about the next step in our evolution. His ideas are like something out of a sci-fi novel. Contrast to this to people like Westside who go around looking at the history of what people ate and hope to find clues to "health". The two paradigms are completely different, worse still is claiming the latter as "Peating".
A small subset of his recommendations factor in the economic reality of some individuals striving for good nutrition, like his comments about starch, leaves and sprouts. But that's all they are: recommendations for keeping your body running with however little you have available.