I found this out on another forum, 2 people have confrimed this so far. They bought their GX in for the cluck and was told TSB is no longer valid, new fix is to lube the drive shaft. To me, thats just a temp. fix not a permenent one.
If your Lexus is not already schedule, they will not apply the TSB. I guess Lexus did not expected such high demand for this TSB and they are rapidly running out of those parts. Perhaps they are greasing the drive shaft for now until production catch up, I don't know.