Unfortunately as others (and myself) have found out, it is impossible to have a rational dialogue with him. He reminds me of some of the X Factor contestants who just because they have ' had a childhood dream' to be a singer think that is enough and talent does not come into it. Regarding his creations, if it looks like excrement, smells like excrement and feels like excrement it usually is, and no amount of spin and quasi- technical terms alters that fact.
It is also noticeable in his reply he does not address the issue of passing off a deco as a custom creation. Whenever I've sold decos on, I've always mentioned their origin and explained what a deco is, he has omitted to do this. Equally he ignores your point about the pickup being a generic cheap one: if as he says in his reply they are all the same and just a magnet and wire, why does his description allude to it being a custom creation? He cannot have it both ways.
In conclusion I do love his patronising and passive-aggressive start and ending to your enquiry too.