I hedged because I vaguely recall one of your posts about some Mexican discoveries that could be older -- but I was depending on my very fallible memory and didn't take time to check.
While I support the coastal migration concept I also think it very likely that people got blown by the trade winds from Africa to South America on more than one occasion. Some of the latest DNA stuff seems to argue for that as well. It's interesting times for this stuff -- finally!
Believe me, I understand that.