Perl gets a bad rep, but a decent programmer should be able to write readable Perl.
I worked with Perl 5 intensively for three years and know the language in and out. These Perl 6 snippets there are mostly foreign to me. It's like how a non-Perler looks at Perl 5: mostly a mess of unexpected symbols with some recognizable keywords inbetween.
That's a fantasy, pure and simple. Taking the statement on its face, let us ignore the undefined boundaries of "good" or "readable" and focus on the practical issue. Have you seen Brainfuck or Whitespace? Many languages are less readable than others, be it incidentally or by design. People are imperfect beings and for whatever "good" means, a "good" or "bad" programmer will write code that is against their assessed skill at times.