Things get complicated after: - later versions like 802.11-2020 have deprecated value 2 in favor of the new Extendeed NSS BW feature - Table 9-272 still implies both 160 & 80+80 - Table 11-23 & Table 11-24 implies only 80+80 but both talk about the 'VHT Operation' Channel Width field and not the 'VHT Capabilities' Supported Channel Width. And thoses had different values even in the first AC amendment So it feels like when no Extended NSS BW Support is used (first gen AC devices), IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ really means both 160 & 80+80
