Uh -- that's a link to your email account.  When I click it, I go to my email account, which doesn't get emails from the NE combat journal.

An in-runner is a brushless motor that has the magnets on the shaft, and the coils on the outside of the motor.  The "in" goes with the magnets.  An out-runner is a brushless motor that has the magnets on a bell that turns with the shaft on the outside of the motor, and the coils on the inside.

Inrunners spin faster, and are actually more efficient at turning electrical energy into mechanical energy at the shaft -- but they do so at speeds where propellers aren't efficient, unless you're trying to go as fast as you can.  20 years ago the solution to the efficiency problem was to run a gearbox -- but someone smart figured out that if you turned a brushless motor inside out you got something that was lighter, more robust, and more efficient than an inrunner + gearbox.  That's an outrunner.