|Chris Hu said:
Your video game knowledge is also severely lacking the PC Engine sold only 5.8 million units. So 13.3 million units is a lot more then slightly more then the PC Engine. Also the PC Engine was actually a success in Japan since it sold 3.9 million units there it just flopped in the west.
It seems that wikipedia page isn't entirely accurate or hasn't been updated.
It lists PC Engine at 10 million here:
Here it also seems to be above 10 million world wide.
Other sources place it at 10 million here: