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Not your fault, you didn't make the image 🙂
Here's a reasonably accurate simulation of what it looks like to me (I can see a bit more contrast than this but it's not far off) - bit of red, bit of blue, mostly a swathe of orangey yellow
@hoefla colourmap as in a map of colour to value, not a cartographic map. Although in this case it's both. Here's a short article but the gist is they are illegible in black and white, they hide details due to being inherently "uneven" and they are illegible to colourblind people https://theconversation.com/how-rainbow-colour-maps-can-distort-data-and-be-misleading-167159
I hate rainbow colourmaps and everyone who uses rainbow colourmaps. It's been well known that they're shit for decades
Sincerely,
All colourblind people