There are two issues:

1. Foxconn claims that the targets have been met, but the empty buildings obviously make some petiole suspicious.

2. There was also a lot of subsidies and government spending based on the deal that is not tied to the targets. This was mostly at the local level (which __really__ can not afford it without the project going as expected) but the state had some too

Not every tax credit had the targets set. The environmental laws changed for the site are vague enough that anything they decide to do there is okay, and many people lost their homes due to condemnation to clear the land, and roads for the plant. (Plus all the money already spent to upgrade roads, freeway off-ramps, power, and utilities in a very rural area.