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Can a Tyranid Prime outflank if it joins a unit that is able to outflank due to the hive commander rule?

But they arent being given a special rule.

Similar to snikrots rule, the hivetyrant allows a unit to outflank.

He Doesnt grant them the special rule OUTFLANK.

So the unit doesnt have OUTFLANK so the prime cant make them lose it.

But he doesnt allow one troops CHOICE to outflank he allows a single troop UNIT to outflank

The tyrant allows the unit to outflank.

The tyrant doesn't grant the unit outflank.

Like snikrot allows his unit to come of any board edge from reserve. His ability lets the unit do that. They dont have a USR to lose to an IC. Thats why ghazgkhull can join them.

It is similar with the gaunts and the prime. They dont gain the special rule outflank. the hive tyrant just lets them complete an action that would otherwise require that USR.