bitchecker was probably just talking stuff and ended up ddosing himself or something else
That doesn't make any sense
You can't ddos 127.0.0.1, because a ddos, by definition, requires multiple individual computers. If you tell them to attack 127.0.0.1, they'll be attacking themself, not bitchchecker.
If you confused ddos with dos and meant the latter, then technically yeah it would be possible to attack yourself, but considering localhost pings never touch network hardware, I don't believe you can sufficiently saturate anything to cause dropped connections.
I think it's more likely the chat log is either completely faked, or, at best, a guy pretending to be clueless and forget himself to get some attention