The borrowing of the French word parler (to talk) in English (spelled parley) comes from the medieval battlefields where "Frenchies" and "Gottons" had agreed to meet every now and then to settle various differences.
In order to express its readiness to stop shooting and start talking one of the belligerent would send some emissary to the other side who would shout "Parler !!!" and the negotiation could commence.
This is why among other meanings parley means:
- A truce or armistice in certain
games; the place of truce
- An informal conference with an enemy,
under a truce, for the discussion of
terms, or the mutual arrangement of
matters, as the exchange of
prisoners; a discussion of terms.
- The beat of drum by which a
conference with an enemy is desired.
See also parley-hill, in Scotland and Ireland, formerly, a mound, usually fortified, where the local disputes of neighbouring districts were debated and settled.
This is far from the suggested meaning in your quote. The only weak link with "parler" I can fiind is that of "to depict as".
Stargate depicts the Egyptian
deities into villainous star-faring
So I'm not too sure how valid a usage this is.