AIUI that's how it started, but to quote from Moose's docs themselves:

Is Moose just Perl 6 in Perl 5?

No. While Moose is very much inspired by Perl 6, it is not itself Perl 6. Instead, it is an OO system for Perl 5. I built Moose because I was tired or writing the same old boring Perl 5 OO code, and drooling over Perl 6 OO. So instead of switching to Ruby, I wrote Moose :)

However audreyt mentions it in her Deploying Perl 6 talk and specifically writes:

What is Moose?

In reply to Re^5: on the fly methods by blazar
in thread on the fly methods by Ojosh!ro

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