So if you read the Service Procedure Flow Chart in the
Palisade TSB it really has only 3 steps.
1 Set cold tire pressure and road test
2 If tire pressure correction fails perform Road Force Variation and Perform force-matching to reduce RFV. Balance assemblies if necessary
3 If RFV fails Replace Prop Shaft & AWD coupler.
Simply stated if vibrations are not caused by the tires and wheels, it's caused by the Prop Shaft and AWD Coupler.
That means it is not related to the self-leveling suspension. It also means there was some defect in Prop Shaft & AWD Coupler components installed in AWD
Palisade from 4/10/19 to 7/27/2019.
Since these components are the same for the AWD
Palisade and AWD Telluride, I suspect some defective ones were installed in Tellurides.
Considering they know the manufacturing dates and the involved components its safe to say Hyundai (and Kia) know what the defect was and corrected it.
So assuming Tellurides are manufactured with the same components, newer Tellurides should not have the issue and a small number (considering the total population) of previous ones will exhibit this defect.
Not that that comforts anyone dealing with this mess.... However a path to success may be available through your states Lemmon laws.