This works to the extent that bots aren't contextually aware of accessibility semantics. If the bot is mindful to the fact that the field isn't displayed, it could skip it. Which is exactly what screen reader technology would do, due to the "display: none;" rule.
Perhaps the trick could work by displaying it but setting the opacity or the height to 0, and hiding it from screen readers with aria-hidden. But I guess that won't fool the smarter bots.
