That still does not give the company the right to fire them, which is the law man... And the company could recognize the union if it wanted. So a vote is not mandatory.
Note the subject of the post: "Kickstarter employees fired for trying to unionize". That's either true or it is not and so far you have not brought anything to the table that suggests it isn't retaliation for exactly that, and in fact substantiated numerically that the chances that it is not retaliation are vanishingly small.
They aren’t independent samples though. They could all have gone on a downward spiral of disgruntlement at around the same time (on the order of months), and then once management finally got around to doing something about it, they started the termination processes at the same time (on the order of days).
Note the subject of the post: "Kickstarter employees fired for trying to unionize". That's either true or it is not and so far you have not brought anything to the table that suggests it isn't retaliation for exactly that, and in fact substantiated numerically that the chances that it is not retaliation are vanishingly small.