Some customers don't just assess the performance of their server based on what they provide for them, and how friendly they are. They also take into account what their server is wearing, and how attractive they are too. It may not be right, but it happens.
This particular server has either been on vacation recently, or they've been working hard on their tan. It's a little strange for a customer to go as far as writing a note of approval for them on the receipt, but we guess it's nice that they noticed.