Yes, that's the source
Oh, I see. I read Markus's post/description as pertaining to Daito Ryu and it seemed strange. FWIW, I never heard techniques in DR being referred to as Kokyu nage. The term Kuki was used. However, different factions may have different terminology for all I know.
Sorry, I screwed it up with the term 'aiki-waza', which are the foundation of the takumakai soden group.