That post is describing a "channel" numbering scheme for various channel widths that no one uses as far as I can tell.cording to this article, only channels 50 and 114 offer 160mhz widths.
When you set a 5 GHz channel, you are setting the management channel. 80 MHz channel width will use four contiguous channels. 160 MHz channel width can be implemented 80+80, which is not widely supported, or 160 MHz contiguous. 160 MHz contiguous requires access to DFS channels.
What devices are you trying? The only devices that support 160 MHz channels are Intel AC9260 or AX200.Weird, but I couldn't get the 160 to ever show up for my devices. I've tried all of the channels including DFS.