Designers hate it when design guidelines are called marketing, usually said by those who have no clue about what design is and are compensating for their own ignorance.
Not, it's not always sufficient - given no points are shown, there may be no visible way to see that anyone agrees (or disagrees) with a point at all.
I do feel that 'this' on its own is a bit trite, and doesn't add much, but it doesn't add 'absolutely nothing' to the conversation - it's a bit of seasoning, like a dash of salt or pepper.