"All their BZX cars" = less than 5,500 cars total. It wasn't just a completely new car model, it was the first one built on Toyota's e-TNGA modular EV platform. The factory line had just barely gotten off the ground.

Toyta sold ten million cars that year so scale wise that doesn't even qualify as a rounding error. The Teslas suspension problems that caused some wheels to fly off effected tens of thousands.