JFC, this isn't rocket science.
This was all about not embarrassing Obama just before election time. Now, less than two weeks after the election, the truth comes out. And the truth is that the Obama administration knew damn well that the attack had nothing to do with the YouTube video, but it was convenient to make that claim because admitting that it was a terrorist attack would conflict with the claims that candidate Obama was making about making Al Qaeda powerless.
You can deny it all you want, and you can pretend not to understand what the criticism is about, but it's really pointless now. The ploy was successful. Congratulations.