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You mentioned that the Shavemac knot has a 'differently looking plug', which I assumed meant "different from the Thäter knot in question", hence referring to the manufacturing process of both makers....

Easily: when looking at a brush, you are looking at the outermost layer of hair. The hair towards the centre of the knot is set higher.

I was talking about the trimming of the tips, by the way.

And an epoxy plug rules out hand tying exactly how? I have no knowledge of or experience with making brush knots, but hand selecting hairs, hand forming them (without cutting), tying them in a knot,...