It wasn’t a threat: UAW has never allowed that type of compensation in a union contract, and have specifically blocked attempts to tie compensation to performance in the past.

The point of the tweet is that Tesla workers are already treated better than their UAW counterparts. Why let the UAW come in and screw it up?

That's not a threat - that's called pointing out a fact, it's called reasoning, that employees would be doing themselves when balancing out the pros and cons; just because Elon's pointing out pros and cons doesn't make something a threat. The employees and union still have the ability to decide based on pros and cons.

This is being warped and a lack of reasoning at the same level of absurdity as changing master-slave language in programming to shallowly appeal/respond to racism issues.