Unfortunately why Amazon stopped selling certain products is not something that anyone at Telus can answer for you. The GE/Jasco devices on Amazon Canada were often sold by third parties and not Jasco themselves. You can order directly from Jasco's website still.
Z-Wave is an old wireless communications standard. See: Z-Wave.
I am so Surprised when I added Z-Wave Smart Led Bulb to Touch Screen Panel asked me "2S Are you Authorized to add device?" I clicked "YES".
Telus Smart Home Security App does not work on 2S (Two-Secure Radio) device-add.
That sound like Encrypt Key for decrypted radio.
Google tell me Zigbee and Zigbee 3.0 have secure radio.
That is not true, I think.
So Does Telus Sell Z-Wave Smart Plug Devices with Two-Secure (2S)?
The products Telus has available can be found here: https://www.telus.com/en/smarthome-security/security-system-products