It is never too early to put winters on....flat spots really aren't much of a thing anymore...and the winters on early!?!?
If a modern tire has a persistent flat spot (not a "I let the car sit for a half year and got a bit of a thumpety thump for the first couple of miles") then the tire is defective.
It is far easier for the dealer to say "buy a new tire" than it is for them to put in a warranty claim with Bridgestone".
Most Bridgestone dealers will warranty this without question - new'ish tire with a defect that keeps it from balancing.
Your dealer needs to be slapped by VW of Canada.