Interesting videos.

I was aware of several of the finds that are showing the old assumption of first humans in the Americas was not correct.

While those are YouTube and so should always be questioned and checked for authenticity of facts from what I have read I think they both had proper facts and finds in them including the brief mention of DNA in South America that indicates some arrived in the Americas from the south Pacific.
That would have been a long hazardous trip in the past but when 'we' have witnessed how quickly various forms of life have naturally arrived and colonized new islands the thousands of years allow a chance arrival perhaps just a group blown across the ocean in a storm and unable to return.

The videos do point out how science works by never stopping questioning and with new technology and finds keeps expanding our knowledge and understanding of how things have developed on this little planet.