You're correct mate and the role of Fletcher has been described hence I hardly ever bring him up when talking about the recruitment structure.
Rangnick is the interim for now and we don't know what the consultancy role will entail. And he himself has stated that he doesn't know what his consultancy role will entail and saw the opportunity of coaching the team for 6 months as a too good of a opportunity to turn down at one of the most prestigious club's in the world.
It's also been reported by Rory Smith formerly of the Times newspaper that Rangnick saw the opportunity to add Manchester United to his CV/resume as one not to be missed, which would only enhance his portfolio when it comes to his consultancy firm, along with Lars Kornetka. Link below.
https://www.rangnick-kornetka-consulting.com/en/index.html
Fletcher's role defined below.
'Involved in long-term planning around academy transition to seniors'