So I just finished chatting with Asus support and I found out that the 160Mhz bandwidth is disabled in Canada.
I have a Asus ZenWifi AX6600 XT8 with 1 node, wired backhaul and using Firmware Version:3.0.0.4.386_45934
The support rep told me that if and when Canada does allow WIFI 6 160mhz band...