I fscking do know what the docs say. They're ambiguous and it didn't
work in either interpretation way I could come up with when I was last
forced to install Debian on a system in a place where only wireless
LAN was available, like a month ago.
As a milion times before, I ended up changing to a shell in the
installer and manually putting the firmware files into the installer
system, which then worked.
I am a DD. I can do that. Any other user would probably have Ubuntu or
Fedora on the box in quesiton now.