Apparently Nintendo will ask the staffing companies they work with for X amount of people, and then sometimes they'll just go "lol actually we're gonna cancel this training seminar thanks anyways." Happened to my boy a couple years ago, and it's happening to me now.
At the very least, the lady I spoke to said she'd keep my name in their systems. This means that I'll still have a chance on the 2nd to do my training. She also said that she was going to forward my info to a bank that the staffing company also works for, and she told me to expect a call tomorrow or Wednesday. That's probably the only silver lining I got today.
Yeah, it's weird as fuck.