No, it uses “Turbo”, also a perceptual uniform colormap from Google. We are aware of that discussion and those other colormaps are also available in GMT.
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It looks like Turbo makes different tradeoffs. It addresses colorblindness and banding but it isn’t perceptually uniform. Twitter thread.
As I said, people wanting other colormaps purely uniform can use
https://docs.generic-mapping-tools.org/dev/cookbook/cpts.html
but these discussions on colormaps almost always ignore the effect of shading illumination (like in the GMT figure above) on the uniformity.