Here's an immigration lawyer page I found about this stuff. - "P-3 Status for Culturally Unique Artists and Entertainers"

"The term "culturally unique" is defined as "a style of artistic expression, methodology, or medium which is unique to a particular country, nation, society, class, ethnicity, religion, tribe, or other group of persons."

So if someone is genuinely unique in themselves, in the way Les Barker is, rather than a representative example of some "country, nation, society, class, ethnicity, religion, tribe, or other group of persons" this would imply they aren't covered. QED.

After all, the USA is the country that inspired the invention of Catch 22...