I asked if it was a NASCAR thing bc if DNF means did not finish, it must have something to do with racing. I have a lot of experience in running and the leagues and road races I've ran in never used the term afaik. I have also watched the Boston Marathon in person more than once and I've never heard the term. So I thought maybe it was from auto racing, and I thought Bryan was from NC where NASCAR is quite popular so maybe it is a regional term. There was no negative connotation meant by asking if it was associated with NASCAR, I was just grasping at straws since I'd never heard of it.
Either way it really seems like racing jargon to me, not part of the general lexicon, and not really a concern. If it is a concern the correct place to bring it up is with the developers, not here.