Ethio Telecom manages the .et extension and you can visit them here,
https://myportal.ethiotelecom.et/ to purchase one. Here is an official reference:
https://www.iana.org/domains/root/db .
You could have at least looked up the Wikipedia page on .ET domains,
https://en.wikipedia.org/wiki/.et
The extension was established in 1995, apparently. First you doubted if the bid on b.et was even real and now you're coming up with more rants hehe! The whole point of this new profile seems to be to rant about a ccTLD and some other sales!
I'm confused as to where you looked this up! It is amusing that you feel a ccTLD could exist without a registry or any legality. I'd like to float my own ccTLD in that case!