Does the doomed timeline theory make sense? Davesprite was in a doomed timeline yet he still had future stuff happen (Terezi found out about the kids later due to Dave)

When someone creates a doomed timeline it does exist for awhile. But eventually paradox space will erase it. And if a person hasn’t died before the timeline is erased they won’t show up as a ghost in the furthest ring, this is why Meenah killed her team when they scratched and why there are no Gamzee ghosts, because he was always alive when the timeline was erased.