I think this is worded incorrectly. Octavia supports TLS everywhere, it is the OVN Octavia provider driver that was installed in Octavia does not support TLS everywhere.
If you uninstall the OVN provider driver for Octavia you will be able to create load balancers.
The key log message is:
2020-03-10 11:04:02.924 24 INFO ovsdbapp.backend.ovs_idl.idlutils [-] Could not retrieve schema from tcp:172.20.0.104:6641: Unknown error -1
Where the OVN driver is stuck in an endless loop attempting to connect to tcp:172.20.0.104:6641. My guess is port 6641 is TLS enabled, but the OVN driver does not support TLS.
This is a misconfiguration in the OVN provider driver and should be addressed in TripleO.
I am reassigning to the OVN team as I believe they have started working on a fix.