Millhouse:
Do you have a contemporary source, or even later-than-gemara source to back up what you’re saying? I’m not fully convinced it’s not aggadeta just because you keep saying so.
Also, while Ethiopians for sure need geirus, from my understanding the standard psak is that they’re safek Jews, not vadai goyim. This is still probably off topic because I’m not sure any posek ever seriously entertained the idea that they were from the 10 tribes.