How do I disable automatic remote printer installation in 20.04?

My neighbor has a printer on our shared wifi network. Every time I go to print something, his printer shows up as an available printer. I have removed it multiple times, and it keeps reappearing, sometimes within seconds.

I tried (1) disabling cups-browsed as suggested in this very old thread and (2) sudo apt purge cups-browsed, but the printer continues to reappear in the print dialog box and Settings > Printers (even after purging cups-browsed).

The printer appears in avahi-browse -rt _ipp._tcp. But it does not appear in lpstat -t, even when the printer is visible and listed as "Ready" in Settings > Printers.