Tire Blowout problems of the 2001 Audi S4

Yokohama yk520 335/45r/17 tires. . . Driving along with my 2001 Audi S4 and started noticing a wobble or shimmy in the steering wheel. Kept getting worse. The tires have less than 20k miles on them so I though I needed an alignment. (entire front suspension has been upgraded). . I took the tires off to make sure I didn;t have a bent rim and noticed both front tires were worn out/cut on the outer corner/lip of the tires. I first thought it was caused by the control arms. My mechanic looked at them and told me that the belts had seperated on both tires causing the tire to "deform" and then hit my control arms/wishbone. He said it looks like another 100 miles and both front tires would have blown apart. That really sounded like fun on the freeway at freeway speeds. . . ! I rotated the front tires with the "good" rear tires, and have checked them every 20 miles. Absolutely no hitting or rubbing on anything. So yes, the belts had seperated.