Broken Link Checking in Discourse

I assume you are referring to this post?

I doubt anything has changed since then. Checking all posts for broken links is a difficult task, and it’s not something our customers have asked us for.

We do have a policy of downloading remote images, and so-called “baking” oneboxes in, so if the link dies (and it was oneboxed) you will still have the summary in the reply itself.