i also love his works .. very much actually. he is one of the most important figures of so called "objective" photography, and together with more recent edward burtidsky is my favorite in this genre. they are rich, versatile and creative both in content and in visual aspects.
and that book is great
as for the ortho film ... u should consider the period when he was saying it. i think current panchromatic (normal) films are different. acutance, sharpness, grain and all the technical and aesthetic variables have been changed since then. the ortho films still have that color response difference of course, but otherwise, in practical photography there is hardly any technical advantage, surely nothing significant from medium formats and on. lets say, photographing with Pan-F+ (50) and Adox/Efke (25/50) is a matter or "feel" and "look", and if so, then we can say the same about comparison of most films. taking even two ortho films, same efke and rollei for example, will give very different "feel", actually, may feel even more distinguished then efke/pan-f.
anyway, the good thing is that u can still use ortho films - efke/adox 50 is great general film, ilford has fp4-like ortho (but only in lf), and rollei has a truly tech ortho film in all formats. so lots of options if u wanna try.