Interesting. The author seems to have provided his... sources. At least he admits that the language can't be learned (but who knows, maybe there is an undiscovered source out there).
http://s155239215.onlinehome.us/turkic/27_Scythians/ScythianWordListSourcesEn.htm
Any thoughts on this sort of stuff?
Edit: I find it interesting that the word "cannabis" (yes, that certain plant) is cited as one of theirs.