Meaning of Noam Chomsky's Comment about Trump
Solution 1:
Use this definition ... genius. A person with exceptional skill in a particular area of activity. Lexico
Solution 2:
The meaning of genius Noam Chomsky is referring to does not seem to be "Exceptional intellectual or creative power or other natural ability" which is "who does a lot brain work creatively (good or bad work)" but "To be especially skilled at a particular activity" which for this case is propaganda. Same way you'd say, "She has a genius for raising money."