Quite a few comments arrived I see. There are some baseless accusations, exploiting a coincidence, with the goal of... probably dividing the userbase.

The attacker only did this: exploiting a bug escalated user privilege on two users and all the global staff to Root (as here  >>/operate/29856/ stated not the server root, but the website Root). There is no moderation action on behalf of them. In fact this is in the public logs (as sated here:  >>/operate/29880/).
Since he had no reason to elevate the privileges of other global staff we can deduce he did it for the lulz, because he figured out the bug, and that he was curious about some IPs, such as mine, and perhaps others.
We can assume he used his window of opportunity to harvest IP addresses from the threads, but we have no evidence he did that.
There is one user here  >>/operate/29855/ who claims to be the attacker, btw.

The separate issue is the threads. There were three threads. Two here on /rus/: #10178 and #88085, and one on /polru/: #3299.
We got an email from upstream that they contained illegal content such as threat of violence, private data and such I already wrote it.
This is how it works with the upstream. We get occasionally an email from them, containing that we have to delete this or that post. This usually useful, because mostly it's some cp that left unnoticed. However last time they sent something, we only noticed the email after they took us off from the internet for a couple of hours. Turned out they notified us because of a thumbnail of a cp spam that CloudFlare cached despite we already deleted the content. After we told them this they switched us back.
Now we noticed the email but we only had 12 hours to expiry, they sent it some time ago (I can ask when if necessary). This is why it coincided with the privilege escalation attack.

It is quite a long stretch to speculate that the attacker was the Roskomnadzor or even that he was Russian.
But I guess noone can stop you from doing it, so feel free.