The answer was given on stats site, and migrated with the post. It is in locked and deleted state. What puzzles me, it is locked after receiving additional vote up (answer has +1 on stats and +2 on SO). And more, how it comes up being locked by Community?
Surfing meta, it seems that I get what locked post is, and how and why some posts ends up being locked. But Community account seems to serve for automated maintenance tasks on stackexchange, so the quesition is, what triggered the mentioned answer locking?