It's a common myth spread around American military forums, in what I believe to have been an early example of cope, it made its way into reddit a couple of years ago

I did a deep dive on this two years to find whether Paul K. Van Riper did anything physically or strategically impossible, couldn't find a thing, in fact many of the accusations get major details of the simulation completely wrong, like claiming he placed cruise missiles on speed boats [he fired the cruise missiles from the coast while he used smaller missile cutters and speed boats jammed with explosives] and I couldn't find any complaints in official documentation from the opposing team about faster than light bike messengers so that appears to have just been made up by forum users

Some industrial essay writer could do a nice little piece on 'misinformation in the service of military reputation laundering' but that person isn't me

Edit: I found some things, it appears the warp speed bike messenger claim originated from a misunderstood quote by Riper referring to the missile barrage “The whole thing was over in five, maybe ten minutes,” this quote was taken to have meant the whole simulation instead of literally just the missiles launching and hitting