GPS accuracy is 3 to 5 metres typically. Anything better is luck or processing. Normal RTH landings use the optical data collected at takeoff to give the almost perfect landings that are achieved. I’d never expect DHP to land the drone.
If you are going to do this be aware of the security risk to your own data and accounts. I’d suggest that you set up a computer specifically to do this with nothing but operating system and the software needed installed and NOTHING ELSE. Giving...