alt Hacker NewsI think you are mostly debating against a strawman of your own construction here. The person you're responding to never claimed that "seeding the random initialization" means literally the same thing as seeding a pseudo-random number generator, and the second message was likely intended as a clarification after being misunderstood. So it's not "2 different claims" contradicting; it's a single underlying claim being expressed through a lossy medium in an increasing level of detail.
My own reading of the poster's intent aligns with this: "DNA encodes the large-scale connectivity in the brain, ie from region to region, thickness of corpus callosum etc."
The grandparent comment is: "humans aren’t born with randomly initialised neural weights", with commenters throwing around harebrained hypotheses about those weights.
Most biologists will fully disagree with the whole premise, and support the reverse claim that we are born with random weights, we learn to walk/speak English/etc after we're born. Not from weights seeded from our DNA.