That's an interesting article. Actually I had heard of the Solutrean theory before but I forgot it because it seemed to have been disproven. When I followed your link, and re-read the material, it looks like the theory wasn't so much disproven as challenged. I'd say right now it's problematical and the odds are against it, but I wouldn't say it was all hooey. It's an intriguing theory that might have some truth to it.
Apparently no Solutrean human remains have been found to date, but that would be a make-or-break moment for the theory, if they could get enough DNA for testing.