Forum:KB:Yoda and the Rule of Two

I recently watched TPM again, and I realised a key plot hole right at the end. In Star Wars, the Sith are said to have been extinct for a thousand years by the time of Episode 1, however Yoda, who is about 870 years old, knows about their secret rule of two. How can this be? Please only cite canon sources.

I appreciate anyone who takes time to answer my question and I am new, so I apologise if I didn’t do something quite by the book here (do let me know if I did).

Lavertus, Bureaucrat of Brickipedia (talk) 14:55, July 14, 2018 (UTC)