Multi-pigment panels exist but in practice nearly all color e-readers still use the filter-based panels, because they are so much cheaper. There are zero Kindle or Kobo models with the multi-pigment technology.

The ReMarkable devices are E Ink Gallery 3 multi pigment display, I have one on my desk.

I did say nearly all, and the price of the ReMarkable Pros reflects on how expensive the Gallery panels still are.