Moose and Class::MOP predate 6Model. As far as I remember and can verify, Moose 1.0 was out (spring 2010) before 6Model even existed or had a name (late 2010).
Moose did take inspiration from the object model designed for Perl 6, but it grew out of attempts to implement that object model in Pugs, not Rakudo. You might even say that it was the first full implementation of the Perl 6 object model.