I was in the factory that makes Apple Earpods. They are one of Apple's highest produced products because they ship with all their iOS devices. All the assembly was done by hand. They were proud that they added a robot to the line. Do you know what the robot did? It moved parts from one station to another station 12 feet away. They previously had a human doing that.
1. It's likely Foxconn had already decided this well in advance of the 2016 election cycle. So him winning the election and this projected deal aren't related.
2. Even if him winning the election may have affected the decision it's still not him doing this, it's Foxconn. And the fact he's promoting this deal makes him the stooge for Foxconn. All he did was give them free PR (I hope his advisors told him that). So for a man who claims to have good business sense he basically did something for free.
3. The tax dollars don't matter, it's the fact Trump is like the soupstone guy from the fable. He didn't contribute anything. He produced exactly no value here.