It seems like a legit run to me.
Anyone know how to make a segment for the day 1 part of the run on Atlanta Ave? It sure looks suspicious. Would be curious to see how other runners tracks look (specifically the street crossings). He has to be on a bike by then. Pace is very, very fast.
From the time he started posting the GPS tracks, my impression has been that there was no grand scheme to cheat. They were only "forced" into it once they realized "oh, shit, this record is actually hard/impossible!". While the first half of that first run is at a stupid-fast pace for a transcon run, I believe it's within Rob's capabilities, especially when he is fresh and full of adrenaline/excitement for the start of a big adventure. Also, attempting to cheat right at one of the most visible places of their entire run would be dumb.
All of the GPS tracks that I've seen posted look like legit runs to me up until May 17th evening/night, the 4th day in. At that point they probably realized that running 7-minute pace for 3100 miles was a lot harder than running 7-minute pace for 30 miles, and had to change their methods.