The thing is, there have been full color PCBs available in the past, apparently just not recently. I've ordered a few CMYK screened PCBs before, I'll see if I can dig them up again because they're gorgeous. It feels a tad disingenuous to be saying they have the first ever, but they're likely the only ones currently doing it.

Edit: I forgot to mention, these are far more refined than what I have, the ones I have have a noticeable amount of dithering and are generally lower resolution. They're still full color though!