GM didn't have any plants in Nova Scotia and that VIN does not match the Avalanche VINS, which would be "C13" (RWD) or "K13" (4WD) in the 5-7 places.

A VIN decoder shows that it comes up "Automotive Innovations Inc", which looks like it converts trucks for export:

"Situated in the beautiful Annapolis Valley of Nova Scotia, Canada, our modern plant of 80000 sq. Feet was built within the town of Bridgetown.
Our company is a Department of Transportation approved truck manufacturer listed with the Canadian Vehicle Manufacturers Association and in the US, with the Society of Professional Engineers.
Automotive Innovations Incorporated - Truck Masters represent the Export Divisions of GM, Dodge and Chrysler. We are pleased to offer a number of Jeep and Chrysler vehicles equipped with Right Hand Drive."

https://www.gmdu.net/corp-455317.html

So it looks like a company that would take a completed vehicle and convert them for European standards.

Looks more like an anomaly rather anything typical. We may not want to list a Chevy but a "Truck Master", as that what comes up with the VIN.