I don't know why you're on about this, but our foot shape has been essentially static across the entirety of genus Homo. The difference in time between us and them is an imperceptible rounding error compared to the many millions of years since bipedalism evolved. These people looked like us, wore clothes, spoke languages, etc. If you teleported one of their infants forward and raised it, it would be virtually indistinguishable from a modern person until you did genetic testing.