It wasn’t election meddling, it was Facebook adjusting their policy because of what they perceived was a negative outcome. As Zuck himself said, no matter what he does, one side will say it’s too much and the other side will say it’s not enough.
This stuff is a real challenge for social media sites. It is a difficult problem that persists. But sorry, your source didn’t say what you wanted it to say.
If you have a better source for your claim, next time I suggest starting a thread with your better source.