The only feature of a QR code sticker vs. a date/year colored sticker that is meaningful is the information embedded in the QR code, and that it is machine readable. The fact that they talk about being able to scan QR codes on passing cars is interesting. Even without my tinfoil hat, I find that interesting. But tell me more about these cameras...

"The ministry will look into updating the software in the cameras on the public roadways, to be able to read the QR codes on the stickers when a vehicle is being operated. When the QR code is read, it will indicate whether or not a vehicle's motor vehicle tax payment is up to date. The system can also be set to automatically send an email to the vehicle owner informing them that they are not up to date with their motor vehicle tax payment. Another feature that can be enabled is for the same message to be sent to the motor vehicle owner's WhatsApp number."