Small helper if you need… I imported the character for scale into a buildings scene, thinking it was just a mesh but it had the jointMover locked set from the ART. If you want to delete the jointMover group, like I did I basically ran this on all nodes in the hierarchy (select them all including shapes)
string $objs] = ls -sl;
for($obj in $objs) {
lockNode -lock off $obj ;
delete $obj;
}