The book is one of many with good training advice; it gets a lot more attention because his name's on it. The principles are nothing new, as Bill Pearl said. The only difference is the amount of volume. The same exercises can be used with reduced volume and frequency.
His published routines have been consistent dating back to magazine articles I read in the 70s, and were similar to what others were doing; no fiction there. His love of volume was such that it motivated him in '80, as most know. Cutting up while on roids following a double-split for 2-3 months a year with no other occupation, while living a great life on the beach is far from impossible.
3 times a week training per muscle's viable including going to failure every workout, if volume's on the low side.
No surprise that only a few mediocre pics of Oliva are included. He always understood that perception = reality for those who don't try to read between the lines.