This is not a duplicate of the 2017 question mentioned. That question was about an event on ELU alone, involving a well known (to ELU) single user, and easily comprehended. This question is about a mysterious SE wide event, involving many sites, and causing widespread confusion across SE. The core of this question explicitly asks whether the event, first noticed by the OP on TGO, involved other sites. The earlier question did not ask about an SE-wide problem.
TGO info on this topic: See the answer on TGO Meta which answers, and has links to other answers, on this point, which, summarized, is easy come, easy go.
Within the past day or two, I lost 75 rep on ELU and 205 rep on The Great Outdoors (TGO). And, 15 other users on TGO lost a total 0f 3,379 rep on TGO. In all, as of a few minutes ago, the average loss on TGO was 224 rep points for 16 users.
Let's stipulate that rep is imaginary and of no real value.
Nevertheless, this widespread large rep loss seems like an anomaly, arguing that there may be a malfunction, or a malicious hacker or user -- something that should be corrected, and restitution made, if possible.
My rep losses were explained as User Removed, which we all know is a valid reason for losing a few rep points. However, under Learn More, SE states:
This removal occurs whenever a user is deleted, unless that user had a very high reputation score. Because high-reputation users have usually cast a great many votes, removing all of them could be that much more disruptive to other users. In such cases, the staff use a special deletion that preserves the votes, resulting in no reputation change. for those who had been voted on by that user.
Again, let's not discuss whether rep can buy you a beer or impress a girl- or boy-friend. Something is odd in at least TGO, and the object of this question is an attempt to find out if the oddness is also on other sites.