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I have not heard of this mod to the overdrive planet, I have seen a steel sleeve fitted to the overdrive planet to help prevent stress cracks and stripped splines but only on the aluminum planet.
The best upgrade to this area is in replacing the aluminum planet with the steel four pinion planet. I do not see the need in adding support to the overdrive planet, its not a high failure spot once the steel planet came along.
Updating the center support to overdrive hub with the bearing style support is a must with this unit also.
I am definately doing the other updates to at least '95 level. I guess I won't be concerned with this mod. as it may be obselete. I will be running the steel OD planet(with new design roller clutch), 6 pinion steel forward (with thrust bearing update) and roller center support.