My understanding is that no artifacts of boats or canoes or rafts of any kind exist from the Bering land bridge period.
It is also hard to understand how you could repair or build a new water craft if your original one was damaged or wrecked.
I am thinking that wood would be in very short supply on the land bridge during the glacial maximum.
Limited wood also means limited cooking and limited warmth.
Almost impossible to understand how enough people survived the coastal journey to the south to create the millions of indigenous settlers that eventually populated North and South America.
Seal skin boats, easy to repair, are still in use today and presumably they were in use then, but of course they would have rotted away by now and the settlements covered by many feet of water.