Repeal of the Chevron doctrine took the power of deference away from executive agencies and replaced it with first-principles judicial interpretation of statutes.

Chevron and the unitary executive theory have essentially nothing to do with each other.

I’m still not sure what point is attempting to be made here.

In effect, it did not. All it said is that the powers enumerated to those executive agencies must be more explicitly laid out by congress. But, that’s just not something that’s going to happen.

So, the gap has been filled largely by executive orders.