It was around '92 that my German friend made comments about not liking the Turks.
Yes, actually Kanacken is a slang originally used by Germans for Turks in particular, suggesting another person (not the Shooter Sonboly) thought Sonboly must have been a Turk.
Also, Sonboly, in the video, actually made no comments about Turks specifically. The translation in post #2 is incorrect and not the same as what is stated in the original article from the Guardian.