Adding OutboundBindAddress has no effect - and since it is an outbound bind address, and does not address listening, I did not expect it to have an effect.
I am skeptical in the extreme of this being a nyx issue. Given bug report is four years old, and resolved in favour of another report that does not seem relevant.
tcpdump shows incoming connection attempts but none which establish.
EDIT: My tcpdump filters were in error - netstat clearly shows incoming and outgoing connections. That said, a python relay connection script agrees with nyx in showing no incoming connections, so it does not appear to be related to nyx issue #9 since in that case the same python script DID report incoming connections. This appears to be a problem with reporting on the tor control port. But as a reporting-only bug, it is far lower priority than I made it to be.