Footprints in New Mexico has changed paradigm of First Americans. One route started from the Aleutians to mainland US, then to South America.
There’s no reason physically to exclude Kelp Highway route from Hokkaido to Beringia, as no archaeological evidence are in far east Siberia. They weren’t Jomon, nor Ainu since 13th century, but Sojin since 38,000 BP.