add to cart URL in woocommerce

[Lablads]

Hey guys,

I've got a question about WooCommerce add to cart urls like "myshop.com/?add-to-cart=X".
These URLs are set to nofollow, which imo means they shouldn't cause any SEO related issues. I went on a little WooShop hunt to see how other shops handle it. Every Shop I found uses the same kind of URLs to add products to the cart from within a category grid or the shop page.
My "SEO guy" is trying to tell me that these URLs are an issue and we need to remove them which (correct me if I'm wrong) isn't possible without rewriting WooCommerce core stuff.

Can anybody give me a definitive answer as to why or why not these URLs are an issue?

thanks in advance
Lad