I'd actually have to agree. My sister is practically vegetarian watching everything she consumes and I have a cr@p diet eat anything & everything. We've always been like that since we were kids. Yet she's always had problems with acne & I've never had an issue. I seen her try so many products and diets and finally now she's seeing a dermatologist now. It's been an awful experience and I can understand when people want to try different things. it's natural.
But what I would say is everyone is different & the causes of acne can be different, so don't rule out any sane advice that cant harm until you've tried it yrself.