strange warning

I bought a replacement cup for my Nutri bullet, and it had a sticker on the bottom which read, 'Caution: only remove once blades have stopped spinning', which means that the people who make the replacement cups have no idea how a Nutri bullet works. After you've blended up your smoothie, you remove the cup from the base, with the blade mechanism still attached to the cup, then you unscrew the blade mechanism, so it's impossible for the blades to still be spinning when you detach the blade mechanism from the cup.