Having read through way too much of that lengthy article (that has plenty of receipts), basically yes. Robinson can be criticized for not being a great manager (though he was in a difficult situation, too), but the stuff about union busting and even simply the accusations of firing people hold zero water.

There's also a fair amount about how the departing staff were informed they would be getting severance pay, and Robinson even suggested more severance pay than they initially asked for, but they were still seeking donations on Venmo and CashApp. If there's a grifter here it's not Robinson.