Thanks for the comment, yes I should have phrased that very differently.

What I was trying to say is that the kernel CSPRNG (exact mechanism depends on version) mixes together a bunch of things that aren't truly random from an information-theoretical perspective in order to produce uniform random output from the CSPRNG function - and that it doesn't actually matter that those sources aren't information-theoretically random. That'll teach me to comment in haste!