After watching that video, I was left with the impression that the guy who did it wants to believe, but isn't being intellectually honest here. He may be right, but not because of anything he said in that hour.
If it comes down to spiral striations in tube cores being impossible to recreate, all we need is clear evidence of spiral striations. So far, there appears to be only one such example, and nobody has been able to prove that the striations are indeed spiral. I would think there would be more examples of spiral striations, and that they would be more clear. Otherwise, I don't think there's any story here.
But like you asked (and it's weird that he didn't even mention it), are the cores tapered like cones? If so, that needs explanation.
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There is a second video from that same account on that very issue, which I watched but did not link. My recollection is that many such holes, in other sites as well, feature these cores, and spiral grooves. The one that has been very well studied is in a British museum, which makes it accessible, and it is also a high quality artifact, making study of it revelatory.
I do not specifically recall the cores being described as tapering, and have to confess that I simply assumed that cores from a tapering hole would be tapered. The images shown of such cores do not seem to have been carved away by a tool that did not bend to fit a taper, however, and seemed to be well fitted to the holes, which would lend credence to their being tapered.
Good point!
Thanks!