Since those people did not acquire seafaring skill overnight, one wonders just how long were they skilled prior to 38,000 BC?
Remember Homo.Neanderthal has documented proof of long distance seafaring in the Mediterranean from well over 100,000 years ago. So modern hominids were ocean mobile well before 38,000 years ago.
The conventional view is that Australia was peopled by those arriving by sea. Then there was no seafaring for 47,000 years, and about 1000 BC others figured it out. Then no one caught on to what they were doing until European mariners arrived about 400 years ago.
The earliest artifacts on SE Asian islands are circa 700K old. The people or human ancestors who made them didn’t walk there.