Probably marketing/promos for new customers vs. actual realized, and I strongly suspect if you click through those Rogers plans you'll land on a much higher total cost.
I looked again after your response, the Rogers plans all state "for new customers only" which is probably the discrepancy. Every time I speak with my parents I'm shocked how much they're paying and I have to spend an hour renegotiating.
https://hellosafe.ca/en/telecommunications/cell-phone-plans/...