As soon as we heard that the signing bonus was related to a probationary period, everyone who knows anything about how Trump does business said, “Nobody is getting that bonus.”
This is a single instance posted with little to no detail in a thread that loves to promote any kind of rumor of a reactionary experiencing hardship.
So, consider taking it with a boulder of salt.
No source. No supporting details. It's just Lefty Forward From Grandma as far as I'm concerned.