This sounds to me like an understatement. Before homo sapiens, most of the world had the biodiversity of charismatic megafauna we still see today in Africa. 15,000 years ago, North America had mammoths, ground sloths, glypodonts, giant camels, and a whole bunch of other things. Humans may not have been involved in all of those extinctions, but it is a good guess they had something to do with many. It is even more plausible that we caused the extinction of every other homo species. There were a few that had been doing reasonably well until we expanded into their areas.
This sounds to me like an understatement. Before homo sapiens, most of the world had the biodiversity of charismatic megafauna we still see today in Africa. 15,000 years ago, North America had mammoths, ground sloths, glypodonts, giant camels, and a whole bunch of other things. Humans may not have been involved in all of those extinctions, but it is a good guess they had something to do with many. It is even more plausible that we caused the extinction of every other homo species. There were a few that had been doing reasonably well until we expanded into their areas.