Ignoring that it might be related to stations where idk. most people can't have children (or they at lest won't survive). The other options is that there can b

Ignoring that it might be related to stations where idk. most people can't have children (or they at lest won't survive). The other options is that there can be while groups of humans in a distant place alive at the same time, but they didn't survive long term and didn't re-mix with the "bottleneck group" at lest not in a way detectable genetically (idk. how precises the methods in question are). The point here isn't that a genetic bottle neck implies the presence of other humans, but that it doesn't say that there can't have been other humans, just that other humans genes didn't carry forward until today.