That's equally true of all internet comments. None of us here on HN have or are claiming automatic credibility. We just make arguments that make sense to us. Feel free to close the tab if you don't find any value in this activity.
You don't think his comment is "an assumption put forward for the purposes of discussion"? That seems a fairly low and generic bar for a comment to reach...
Readers are just going to assume it’s random noise, or at least indistinguishable from noise, from a rando on the internet.