Methinks the reporter is misunderstanding things. AFAIK there is zero evidence the Clovis culture people were wiped out, only that their culture, supposedly based on the hunting of megafauna such as mammoths, disappeared when the megafauna went away.
The people presumably then altered their way of life to the point where they were no longer the "Clovis culture" people.
BTW, the traditional POV, now non-PC, is that the Clovis culture people and other early Indians wiped out the megafauna by overhunting, and possibly by "managing" the landscape with fire. I've always been skeptical of that notion myself, though I do enjoy watching it make liberals sputter. And the timing of the disappearance of megafauna all over the world does seem to have a close correlation to the appearance of humans in those areas.
That's why the Liberals are desperate to find a comet or asteroid to blame all those extinctions on, they need it to keep their Noble Savage myth going.
To believe it was not man, you would have to believe that whenever man first showed up at a new location, by some amazing coincidence an asteroid or comet always would soon hit in the same exact location wiping out the local megafauna.