It's pretty safe to assume that YC has received DMCA takedowns for stuff on HN given YC has defined a process for dealing with them (https://news.ycombinator.com/dmca.html). It's interesting because really what copyright infringing material can news.yc host other than something posted in a comment? news.yc is after all merely a list of links to external hosts controlled by unrelated 3rd parties.
Generally, if you have a question about what happened to something on HN you should email info@ycombinator.com and someone will reply to you. The terms are quite clear on that. IIRC people have been hell banned for complaining about HN/PG on HN instead of emailing them.
You mean well, but you're mistaken on one thing. Having a registered
"Agent of Record" along with contact information and a policy is
required to be eligible for "Safe Harbor" provisions. Pretty much any
US-based site accepting user contributions must have them to avoid
copyright infringement liability. YC/HN having all these requirements
filled is entirely normal and expected, so it doesn't really tell us
anything. --Heck, I'd be really worried if they didn't have all of the
requirements filled.
As my EDIT shows, the [dead] was due to the submission being a
unnecessary duplicate post. It turned out to be a bad example for the
real question in the title.
Mentioning the [dead] post wasn't a complaint, instead, it was just an
example that led to the question in the title of whether or not HN has
received any DMCA takedown notices. The follow-on question of whether or
not PG/YC would be willing to publish any received DMCA notices on
ChillingEffects.org is also viable.
In spite of the poor example link I picked, they're still good questions
to ask publicly and it seems a lot of people are curious about the
answers. None the less, you are still correct about emailing
info@ycombinator being the right way to handle questions about stuff
that gets moderated/deleted/edited.
(BTW over the last half decade I've sent in more than enough private bug
reports directly to pg with my phone number included so he could contact
me. I probably have some minimal "good will" stored up and I sincerely
doubt he'd hell-ban me or anyone for a poor choice of example links.)
Generally, if you have a question about what happened to something on HN you should email info@ycombinator.com and someone will reply to you. The terms are quite clear on that. IIRC people have been hell banned for complaining about HN/PG on HN instead of emailing them.