You mistake the general effect of this order.
There are regulations for actors to be admitted to be under Blanco's control as LEO's. This order relaxes parts of those regulations, and therefore made it easier to obtain LEO under "her" control. It most likely smooths the way for actors who are LEO in extra-LA jurisdictions.
At any rate, the order has ZERO relationship to federal action.
A separate writing, which we have not seen, empowers NG activity (which, FWIW, is not federal action in the context of disaster relief).
And yet again another separate writing, which we have not seen, empowers active-duty military to perform evacuation activity.
I respectfully disagree, for the reasons I stated earlier.