The part of the site that shows the recent connections to your account, with IP's. People were sharing those IP's and thoughts in the linked thread.
That data came from somewhere; if it's related to this bug then this bug is also pushing incorrect data into other parts of the service. It's also entirely possible that it wasn't a bug, and instead a security issue, and that data is correct, and they're bending words to play it off as just a bug.
I can understand a bug triggering a warning system, but when it's also presenting related data in the account security logs; it's either a complicated bug or there's more to the story.