The implication from the report is that since similar items are found elsewhere, and from earlier periods, that somehow they too have managed ceramic technology.
We find hearth boards, we don't really have the ends of the spindles recorded.
Perhaps that though is because excavators, who do not themselves use the technique, don't realise that the wee charred ended bit of stick is actually part of the fire lighting method, and not part of the fire debris.
Thing is too, hole boring sometimes leaves similar marks to fire making on a drill end. Not always, if it's been used with fine gravel to grind through stone, it doesn't. Pump drill tips ?
Interesting though.
What else would we drill ?
cheers,
Toddy