https://twitter.com/yeselson/status/1380363511709196288
The short version is: while the Bessemer campaign was a good thing, the vote (according to this person --- everything I'm writing here is according to Yeselson and subject to errors in my understanding) was not. To wit: if a skilled organizer effort isn't sure it's going to win, they pull the vote, reorganize, and try again when they're sure they will.
There's further evidence in the threads that nuts-and-bolts organizing, "101 stuff" to use the term I got from labor organizing blogs following up on this, wasn't done; that in fact the worker opponents to unionization were only weakly opposed, and under-educated.
Another fun Google search that I found from this thread: [union "hot shop"].