Initially, no. They were running an unmodified version of OSX over what is basically an EFI emulation layer. In the newest patch, Pystar introduced a slightly modified version of OSX. Modifying code without consent is a violation of copyright.
So that explains why they took so long to act! They only just got them in their new release!
Clever clever Apple, changing 10.5.4 so they needed to patch it for it to work...