They may have had too many inteoverts already and needed to balance things out (though personally it’s hard to imagine giving a test like that any weight compared to actual interactions with a person).
Whenever I try to fake it and act like an extrovert, I'm pretty sure it comes off fake, weird, and quite possibly creepy in an "uncanny valley" sort of way (i.e., "He's acting like a human being, but something's off").