Even before Tecteun was named, there was always a creator of regeneration who was NOT and was NEVER Omega. I do not see any retcon here, they are both founders of Time Lord society, as Omega created 'time' travel, he is therefore the first 'Time' Lord.

No. Cercie is not Queen, she's Queen consort, later dowager. She's never holds the title Queen as monarch, only as the consort of a monarch. And she never holds power in her own right, but on behalf of another - that's what regent means. This is mentioned in the article.