Bill Gerstenmaier was talking about the flight test 4 landing accuracy, which landed on the open sea in the Gulf of Mexico, not on the tower like the recent test flight 5. The only thing nearby was a buoy. I'm pretty certain it didn't have advanced laser systems.
There’s a big cross in the middle of the landing pad that you’re trying to aim for - you don’t need advanced laser systems to get an accurate fix on where the landing pad is from the rocket - or where the rocket is form the landing pad for that matter.
