[sibrahim]

Anything that reseeds during operation can qualify. In fact, if the CSPRNG's internal state isn't large enough, you need to periodically reseed or face the same objection.

But a CSPRNG which you need to explicitly seed with random bits as big as your output isn't providing much value (simply whitening) since generating the seed is the same problem you had before adding the CSPRNG. So you end up looking at a TRNG.