This is a silly thing to do three days before a GE, but keep in mind that RPOF and RNC have always had a crew running Trump's GOTV operation here. Obviously, they're not built to handle the job all by themselves, but they're competent from what I hear, and they've been on the ground since at least September.
It won't save him, but from what i've heard it was meant to provide a buffer for the down-ballot and provide coat-tails for Trump as a spill-over effect.
Right, but he hasn't been giving the state party money for the entire month of October. They're doing it with funds from the RNC and Trump's been giving them shit too. The party is doing a lot of the heavy lifting, but they're, from what we can tell, just turning out their regular voters. Pretty much each R in the state is depending on the state party. It's an interesting (read: stupid) strategy.
The key point of the long term ground campaigns is to get massive voter lists and to narrow it down to focus the votes that need the most push to get to the polls. (generally non standard but GOP leaning voters)
If the crews arrive in the states at the last min with barely an operation already there, the ground work wont have been done and they will just be grabbing voters that most likely voter R anyway.