No, it swept the problem under the rug. The car still has an electrical problem. This is very likely a bad siren module, but it can be a leaky diode in the alternator, water damage to the CLP/SSM, or a failing FCM. (Or any of a NUMBER of other items.) It is very likely that, eventually, this issue will rise to the surface (locking system will fail, fan operation will cease, A/C will refuse to work, alternator fails, etc.)

At least you are selling the car with a sign that says, "This car has an electrical issue", in the form of the kill switch. So, you ARE being (unintentionally) honest.

Finding excessive battery drain is not that hard to do, it's just that almost NO "mechanics" even try to learn how.