Hmm...Tire Rack lists the RE-11 as available with both the 180 and 200 ratings. The 180 ones are $20 cheaper per tire, so I assume those are the older ones being sold off at a discount. I'll bet this is a similar deal to the Hankook R-S3: Hankook changed its UTQG rating from 140 to 200 in order to let it be used in SCCA autocross street classes. UTQG rating is set by the manufacturer, and ultimately has no consequence. Same tire, different stamp.
Sorry, I'm new to Canada, is there an MTO requirement for treadwear rating?