It is a bit odd, but it's also not unheard of for employees to go to flight school and move from a role like dispatcher (which is a more involved role in the US than in other countries - dispatchers share joint responsibility with the flight's captain) to pilot. The fact that it says "worked for" instead of "flew for" makes it rather ambiguous whether all 18 of those years were as a pilot.
It is a bit odd, but it's also not unheard of for employees to go to flight school and move from a role like dispatcher (which is a more involved role in the US than in other countries - dispatches share joint responsibility with the flight's captain) to pilot. The fact that it says "worked for" instead of "flew for" makes it rather ambiguous whether all 18 of those years were as a pilot.