Watched it, and I agree.
If they wanted kids to be able to differentiate between between the pins, at least make the colours more...compatible with other colours of the colour wheel. Like maybe have the pins be different shades of grey like the CCBS bones, unless kids are that numbskulled that they can't even tell that apart.
In all seriousness, I'm sure that Lego has already tested out plenty of colours for the pins/axles during play tests and found that red and blue were the easiest/fastest for the kids to see and use. Regardless, no matter what, it's the final product that matters. And in the final product, red and blue pins don't work.