Yes, they cite some articles. I didn't look into it very much though. I can't guarantee they are peer-reviewed, but I think at least some of them are. I didn't pay close attention. *shrug*
Yes, it does seem he is just taking a vegetarian spin to regular bodybuilding principles, but I like it because other people make it seem impossible to get enough protein/other nutrients as a vegetarian (including fairly well-read health "experts"). I get frustrated with the close-mindedness of all that ridiculousness. It's really not that difficult, and it doesn't require that much extra effort (if you're already putting in the effort to pay attention to your food and nutrients). Yet, they all make it seem impossible (some of them flat-out say that it is impossible). And, vegetarian health "experts" are just as skewed. They tend to suggest that you need much less protein than other experts say you do. Although it may be true that you don't need quite as much as other experts say you need, the vegetarian health people give a super low-ball number that seems equally implausible. So it was cool to find someone that is both a vegetarian and someone who isn't scrawny. lol.
Plus, it's always cool for me to find vegetarians that aren't stereotypical vegetarians. After living with 8 messy, stereotypical, vegetarian hippies, it was a little refreshing to find a different type of vegetarian. *shrug*