There can be many reasons. The SEL might have been on the lot for 90 days, so there was a financial incentive for the staff to move it. Might be a Hyundai incentive to move all the 2019s before September 15th, and a fleet account is already contracted to take all the SE models they will get this year. Might be too many of a certain color. Might have taken it back in a dealer trade and they got $2000 to take it.
Whatever the reason, it is nice of them to pass on $ savings to you.