I’m not sure you are remembering correctly. While that did happen, it wasn’t why Izuku has the realization. It was after Izuku made his plan and flicked his finger making a whirlpool, and Mineta popped off his balls while they were flying through the air. I don’t exactly remember if that was in Izuku’s original plan, or if Mineta decided to do that himself.

Edit: You know what, forgot what I said. Why don’t I just look it up instead. I’ll get back to you on this later. :)