It's true that it is more difficult to port from Common Lisp or other Lisp-2 dialects to Scheme, Racket, or Clojure (which are Lisp-1 dialects) than it would be to port to other Lisp-2 dialects. But that certainly doesn't make Lisp-1 dialects "not Lisp" while Lisp-2 dialects are "Lisp".
Comments
It's true that it is more difficult to port from Common Lisp or other Lisp-2 dialects to Scheme, Racket, or Clojure (which are Lisp-1 dialects) than it would be to port to other Lisp-2 dialects. But that certainly doesn't make Lisp-1 dialects "not Lisp" while Lisp-2 dialects are "Lisp".
Porting code from Lisp-2 to Lisp-1 is not that difficult.
Example:
Lisp-2:
Lisp-1: Another example:Lisp-2
Lisp-1 To make it easier, just define FUNCALL, FUNCTION and FLET in Lisp-1...