no he did but recommended beginners do not if they are a thin underweight bodybuilder because he believed it would put their system in a state of shock and prevent normal muscle gains .. see "The wild physique" by Vince page 58.
A glance through my post history will reveal that I am a HUGE Gironda mark, but I willingly concede that he didn't know
everything, and some if his ideas - especially some of the more radical ones - are maybe a bit off the mark; duplicating the effects of anabolic steroids through increased dietary cholesterol and use of glandulars, for instance.
As for abstaining from direct ab work, I've personally never noticed any measurable effect, but that's not to say that nobody will.