I disagree on those as identifiers - they're pretty clearly conscious affectations.

'amerìkānskī' is an existing word, but it's an adjective describing American-style things. Converting it (via English rules) into a mocking noun for Americans appears novel, and I can only find a few instances of people using it as a joke on forum threads.

Plenty unique, then, but not something the writer would likely stumble into using ever again.