EN48
Yes you did not understand. The nodal beam is not part of the drivetrain. It is the pylon support or basically part of the airframe.
As to vibration suppression Bell's attempt to have no nodal beam to reduce cost resulted in unacceptable vibration. To correct this Bell installed a liquid vibration reduction system on production models which is similar to a nodal beam in purpose. The Frahm is a standard device to reduce vibration further if desired and can be found along with active hammers on 429's, 350s, 76's, 92's etc.