Ask HN: Why can't I discuss my own submission?

I recently submitted a link to a good article on a site that contains a lot of 'woo' (religious, anti-vax, anti-science, etc.)

I'd have liked to a) discuss the content and b) disclaim any general endorsement of the site, but for some reason there's no 'discuss' link on the item. I presume there's some sort of "can't discuss your recent post" policy in place, but that seems odd, as I know I've been able to do it in the past.