LISP seems like an awfully bad example to express what he's trying to say here, point-free tacit programming is probably able to do a better demonstration of his meaning than any language naming parameters and functions, because doing so inevitably leads to single-character names in the name of "elegance".
@neauoire
Maybe "smaller" isn't intended to mean "less characters" but "less complexity/structure" in this context.
That way you can still have readable variable names, even local variables to make steps more explicit.
The "LISP elegance" in the text seems a bit loosely defined.
Are we allowed to have a library of common functions?
Does every function we use count against the "size" metric?