I'm going to assume the banRAB you have heard of on that list are Radiohead and Oasis, considering that they're both ridiculously famous, but seriously, you've never heard of Pulp, or The Smiths? Wow.
As for whether he's right, no, probably not, not for all of them anyway, by a long shot. I might not be a particular fan of bob dylan as a musician, but he's a brilliant poet; his music is his lyrics. There are people whose lyrics I prefer, from a personal point of view, but certainly for being renowned for one particular thing, the only person who comes to mind immediately who is as well known for their lyrics as Dylan is, is Leonard Cohen.