It's
RG
GB
that doesn't fully cover the "white" pixel. Not true RGBW at all. There are some strange "Pentile" displays that are RGBGY.
The RGBG is rare on LCD and more common on OLED. Neither of those has partial colouring of the pixel because they don't need to. The Kaleido would be as dark as Triton. The white area means the colours are only ever pastel (i.e. abysmal) and a compromise to improve brightess,
You must have an unusually brightly lit home to be able to read Kaleido with no front light. Kobo just gets the regular Kaleido panels from Ink Corp.
The only ereader I have that's too slow is the Kindle DXG with PDFs. I've Kobo Libra, Libre 2 and Sage, Kindle K3, DXG and PW3, and Sony PRS350 currently. I've had others.
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I think it's totally fair to say it's 300 PPI since a letter at the same font size will have exactly the same number of black pixels on a Kaleido 3 screen as a non-Kaleido 3 screen.
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But not true for white pixels, or edges of "black". Also in bright light (ambient or frontlight) the coloured dots reduce how neutral black the black is due to their coloured reflectance.
It's a compromise for those that want colour on eink.
The sole objection I and others have isn't the existence of the Libra Colour, but the lack of choice, that there is now no mono 7″ from Kobo.