It's a pop sci article. It shows off advances in our imaging capabilities and hopefully inspires a little wonder about the universe. I believe the intended takeaway is something like "neat! We can see a lot of stuff going on in infrared that's hard to see in the visible spectrum". The rendering of other wavelengths as red, blue, and green pixels is a very standard scientific visualization method for multispectral imaging, and the article makes it clear what choices they make to do so.