It's true that the stream-cipher and/or hash-based CSPRNG constructions that are commonly used are not broken by quantum computing.
CRQCs impact more than just public key crypto though, and there's more than one way to design a CSPRNG, so it's not true in the general case that they have "no" impact on RNGs.
I believe that Blum Blum Shub, Blum–Micali and Dual_EC_DRBG (backdoor aside) would also be broken by a CRQC.
Technically correct, but the RNGs you're mentioning are essentially RNGs build on public key cryptography. And I don't think they're widely used, simply because they're slow and have no advantage over faster ones (the Dual EC stuff was, as far as I know, the only thing that was somewhat widely used, and, very obviously, nobody should be using that).
CRQCs impact more than just public key crypto though, and there's more than one way to design a CSPRNG, so it's not true in the general case that they have "no" impact on RNGs.
I believe that Blum Blum Shub, Blum–Micali and Dual_EC_DRBG (backdoor aside) would also be broken by a CRQC.