Could one not categorize material published in a book, magazine, or on television as 'commercial speech', liable to restrictive licensing and censorship? This seems like a slippery slope which the USA is on the correct side of.

Commercial speech is not the same as advertising.

The product is the same as the speech, whereas in advertising the speech is in sycophantic service of another product.

I agree that commercial speech is not the same as advertising, but the comment I replied to was talking about restricting commercial speech, not advertising.