Sounds like he has a ... T3? It’s been a couple years since I had the different terms memorized. One of the connections out there (rare) is 45Mbs which could max out the speed test’s bandwidth and result in that rather weird number.
I don’t think he’s got a T1 or T3 or anything like that. He wouldn’t pay for it or know what he had. It’s just a fast but ordinary cable and computer that he uses for his business.
Maybe I should check out ComCast site to see.