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Everybody can buy custom tapered pots from CTS - if you get enough of them.
Some years ago some vendor - I think RS guitarworks or some name - did that and people liked the pots. Of course there is confirmation bias once you spend money, so YMMV.
To me these which the op talks about seem in line with stuff you get from Mojotone, RS Guitarworks, Crazy Parts etc. - tighter tolerance, altered audio taper pots. I have a set of Crazy Parts 500k VT in my SG and they made a nice difference - restored some of the high end that was missing with the stock 25% tolerance linear CTSs.
One of my favourites is the low friction EVH; also pricey but a nice even taper.