It was not, in fact, "loss of habitats ... and overconsumption". It was, in fact, the comet strike. Habitat increased throughout the period that glaciers were melting, from 20kya to 8kya, opening up basically all of Canada.
That’s taken into account for in acceleration, however megafauna extinction events start 50kya and are confidently correlated with human population increases.
That paper wholly fails to even mention the comet strike, except a single references entry to a 2007 paper. Its heavy reliance on Todd Surovell, a Clovis-first holdout, tells us all we need to know.
We have no reliable data about human population levels in North America, so nothing to correlate to extinctions.
