I have experienced this as well, or at least one part of the "Solo" effects not working. My Rotta has all three Omicrons, and the Omicron for his Unique "Pedunkee Mufkin" states:

Ally Hutt Cartel Tanks Taunt for 2 turns at the start of battle. Whenever Dark Side Support allies attack an enemy, all allies recover 10% Health, Protection, and Turn Meter. Dark Side Hutt Cartel allies and Rotta can ignore Taunt effects during their turn. All Hutt Cartel allies are immune to cooldown increase and Rotta is immune to Thermal Detonators.

If Rotta the Hutt had a full squad of Hutt Cartel allies at the start of battle, whenever they have Turn Meter removed, Rotta has a 50% chance to gain a bonus turn.

If Rotta the Hutt was the only ally at the start of battle: Whenever an enemy removes Turn Meter from him, he deals damage to all enemies equal to 10% of their Max Health (this damage can't defeat enemies) and has an additional 30% chance to gain a bonus turn.

While in Grand Arenas if all allies are Hutt Cartel at the start of battle: All allies gain 50% Max Health. If all of Rotta's other allies are Dark Side, whenever they or Rotta are inflicted with a debuff, they inflict a Thermal Detonator on the enemy that applied it for 2 turns, which can't be evaded or resisted. Whenever Rotta defeats an enemy, the cooldown of Showboat is decreased by 1 and all allies gain bonus Protection (40%, stacking) until the end of the encounter.

If Rotta was the only ally at the start of battle: He takes reduced damage from percent Health effects and defeated enemies can't be revived.

Bolded section fr the issue. I took my Rotta team (Greedo, Gamorrean Guard, Cad Bane, Mob Enforcer) up against a Pirate King Hondo Ohnaka team (with Captain Silvo, Vane, Brutus, and SM-33). When Pirate King Hondo Ohnaka used his Ultimate while members of his team were dead, they revived.

Given the wording of the Focused Datacron, I would expect the "defeated enemies can't be revived" to be part of "Rotta the Hutt's solo effects".

How long is CG going to ignore this issue?