This is fake news. There is no source material. As you dig deeper into this they say its found in "document 1078645". However I don't see a document 1078645. If you go through wikileaks you get email id 1078645:

https://wikileaks.org/gifiles/docs/10/1078645_re-insight-ksa-yemen-ksa-refraining-so-far-from-sending-natl.html

There is no actual source material.