There is no point in doing that again. If it was about a year back, yes, to know who locked a topic, you would just have to send the OP a message to know if he or she was the one that did it or if it was a moderator, but after PowerGlove provided a patch to fix that, it's very much easier now without stress to determine who locked a thread by just right-clicking on the padlock symbol if you are using a PC, and for mobile, just hold that symbol for some seconds, and it will show you who locked the thread. As for the thread in question, it was locked by a moderator.