Hello people;
TLDR: You can ignore 'You are unsubscribed from commons-l' email.
At 6:21 (UTC) today, I clicked 'unsubscribe everyone' instead of 'unsubscribe selected users', and proceeded despite the subtle warning page. On a second reading of the warning, I realize I did something wrong, and closed the browser in an attempt to make it stop. It was stopped, but browser proceeded to remove people, and this resulted in removing email address starting with A to somewhere in middle of K to be removed.
WMF Database admins reverted my mistake at around 13:22 (UTC) today; [1] your subscription settings should be as is before today. If you received 'you were unsubscribed' email, __you do not need to do anything__. However, if you re-subscribed during that time (6:21 ~ 13:22), your subscription settings are not restored. Also, if you unsubscribed between that timeframe, you may have been re-subscribed. Sorry for the confusion and you can safely unsubscribe now.
This should be the end of today's drama.
Thanks!
[1]: https://phabricator.wikimedia.org/T379519