Nemo bis believes that the extension should continue to document Asirra even though it closes down permanently as of today [1]. He thinks that this not functional module should be documented until it was removed from the code base. I do not think that this is a good idea. However, I just opened a bug for removing Asirra integration from the extension: [2].
[1] http://research.microsoft.com/en-us/um/redmond/projects/asirra/