Forum:Is the Doctor in Sympathy of the Devil of mainstream continuity because he appeared in The 100 Days of The Doctor?

I hope that my question can be understood from the title. The Doctor (Sympathy for the Devil) is a page with the Nondwu tag on it, and for a very solid reason; he was introduced in a piece not meant to be cannon. But he appeared briefly in The 100 Days of the Doctor (audio story) when the Doctor and Evelyn "side step" into his universe, so should he be considered mainstream because of that? Keep in mind that this is different from Forum:Is The Curse of Fatal Death canon? because that was covering a very vague reference to the alternate Ninth Doctor, while this story is an obvious appearance.

And if he is "in-universe" or however tou want to say it, does that mean that his original two stories are as well? OS25 (talk to me, baby.) 05:25, November 24, 2012 (UTC)