Burnishing concrete has been done for years. It was done to make floors harder and more durable. The process will also bring out different colors and used with diamond pads, will make it look similar to polished concrete. One of the pictures appears to clearly show a puddle of some sort. This leads me to believe there was more going on than burnishing. Also, burnished floors are more labor intensive and no contractor is going to do this without specifying and charging for it. It would be nice to have a couple more up close shots as well as a wide angle shot. Let us know what you find out.