I've not read this book yet I don't think... whatever, it's hard to judge a quote like this out of context at the best of times. But my gut feeling is that he's shock-factor exaggerating. I mean, I find the use of the word 'envy' surprising, even in terms of describing publicity rather than fashion photography (which is your specific interest). Why not 'aspire' or 'desire' - 'lust' or 'greed' even? But not envy.
Because for me the word envy is up there with hatred as major evil. I swear I'm not religious but, just from observation, envy may be one of the most damnable emotions that can afflict anyone, subject and object. It seems to be the only 'sin' that has absolutely no redeeming features. Like a form of spiritual leprosy, it putrifies its subjects from within and, as projected (self) loathing, stinks out everyone it comes into contact with.
Envy can be found in every domain, not just fashion/photography - but it will always be at the most obstructive, vile, snidey, pap-crap-lowest-common-denominator-arse-end of anywhere you care to examine. Absolutely nothing glamourous about it, actually?
Envy is, as ever, "created through a lack of honesty, a lack of openness, a lack of humility and humanity" - but not just in fashion photography. It's everywhere. More prevalent in the fashion industry generally though? Doubt it but don't know.