I am sorry, I donāt use HAOS anymore. I have several Raspberries and other SBC, but I donāt know enough how HAOS differs from vanilla Debian12 and donāt want to spend time on it.
Thanks @e-raser and @Front ,
With your help on getting the mount and the correct vi commands, I managed to add a line to disable wifi adapter of the Raspberry PI.
added line: dtoverlay=disable-wifi