In as many as 24 separate sites of origin, the paper explained, people began farming within a few thousand years of each other[...]
And I would add the always-important addendum: that we know of. It is interesting, though. It could be there was some kind of contact, even if a one-off of someone blown off course with enough knowledge, here and there over several thousand years. It could be deeper contact or exchange than was known. It could also be some ancestral thing passed down, but not done during the last glacial maximum, then restarted when it was possible. It also could be complete coincidence.