The particular claim was that Perl programmers extend the core language via Perl's ability to do meta-programming and that Perl is more flexible than other (comparable) languages. Further clarification with regards to DSLs show that the poster meant that Perl has been more flexible for quite some time (before Ruby hit in the western world) -- ie: from the time that I did look at Perl rather seriously.

At that time there were already quite a lot of movement within eg: python with improvements being made to the language, in the language itself.

So, yes, I guess I'm sticking to my guns.