McGruff and Codeflier are who outed him.
I think we can surmise what happened by the story of being here long ago, but having to create a new account. This is a never Trumper that got frustrated and left - probably did an opus under the previous account about how he couldn’t believe people on FR were supporting Trump. Now he has decided to come in and start impugning Trump because he sees a window with this “crisis”.