Any proof?
It doesn't work on C6U which is the same hardware.
Firmware Version OpenWrt SNAPSHOT r21449-03518a1b3a /
Sun Dec 11 08:53:35 2022 daemon.notice hostapd: phy1-ap0: interface state HT_SCAN->DFS
Sun Dec 11 08:53:35 2022 daemon.notice hostapd: phy1-ap0: DFS-CAC-START freq=5500 chan=100 sec_chan=1, width=1, seg0=106, seg1=0, cac_time=60s
Sun Dec 11 08:53:35 2022 daemon.err hostapd: DFS start_dfs_cac() failed, -1
Sun Dec 11 08:53:35 2022 daemon.err hostapd: Interface initialization failed
Sun Dec 11 08:53:35 2022 daemon.notice hostapd: phy1-ap0: interface state DFS->DISABLED
Sun Dec 11 08:53:35 2022 daemon.notice hostapd: phy1-ap0: AP-DISABLED