The problem is that "relevant" is a frustratingly vague word. Google probably even believes that this is their mission. But when you talk to marketers, "relevant" is almost always going to mean "most relevant ads".
It's like with "engaging", which sounds good on paper, but by now we all know that "engaging" just means "addicting".
It's like with "engaging", which sounds good on paper, but by now we all know that "engaging" just means "addicting".