Brazil has a bunch of archeological sites much older than the last land bridge on the strait, of course several historians go histerical with the mention that prehistoric humans might have crossed the pacific by boat, so to them only the strait idea is valid and south american paleontologists are liars...

Or they just say that humans arrived here by unknown means, anyway we have 40.000 year old settlement sites, 40.000 years is time enough to extinguish whatever you want even if your population is in the hundreds...