There’s a video from a different angle showing that he starts way behind the timing line, so he’s already running at full speed when they start clocking him. That’s a big advantage if comparing him to the way other people are timed in the 40. Even so, that seemed more like 5 seconds than 4.1.
I’m not saying it’s not fast, especially for a random fan, but I don’t think it’s quite the story that twitter account was making it out to be.