The Chair Force Engineer (aka “Mr. X”) likes the TeamVision approach to the VSE. I haven’t read it myself, so I don’t know if they claim that the Shuttle is “man rated” as Mr. X does (though he also uses quotes, so perhaps he’s not really making the claim). It is not, and never has been. “Man rating” is whatever NASA decides that it means, and it’s usually just an excuse to not use a vehicle that they don’t want (for other reasons) to use.