It came from Bike Snob so it's highly dubious.But the post included a photo

"But while Cavendish's victory salute may have been sub-par, his sprint certainly wasn't... This would explain why Cavendish forsakes the usual crabon fribé frame and instead opts for riveted alumin(i)um:

(I'd link to the relevant Cyclingnews page but their new site is even more confusing than my pannier.)"