Nighthawk MK6x 5GHz 160MHz channel width?

Quick reply: Not everything designated AX or WiFi 6 is per se an 8x8 system using 80+80 MHz channel blocks with some 1920 (of 2048) subcarriers able to handle PHY rates of some 9600+ Mb/s.

Longer reply: Can't find the Nighthawk Mesh system in the list referred. But then, the MR60/MS60 are designated as AX1800 Router & Satellite 2x2 (600 + 1200 Mb/s) - a 1200Mb/s PHY rate is achieved in a 2x2 system on a 80 MHz channel, 800ns guard interval, with 1024-QAM 5/6. No need for either 80+80 MHz or 160 MHz channels at all. That's perfectly sufficient for the majority of mobile WiFi 6 clients by the way.