Yes, I've seen his site, it's very useful and interesting.
However, on that particular issue he fails to present us with examples. If I ask someone for examples of people who've built strong and big legs and backs from squatting and powerlifting, people can give me links and books, I could spend the rest of my life reading the stories as a full-time job.
If I ask for examples of people who've done it with lunges and step-ups, the silence is deafening.
I just don't see any proven alternative to fcking hard work.