What is it then? Which other managers use it?
Similar to false 9, positioned behind the strikers but rather than primarily skilled on the ball moves a lot without it, for exemple drifting out wide to create space for other players. Think Özil.
Found this:
https://thefalse9.com/2015/11/football-tactics-for-beginners-the-false-10.html
Not a chance he was playing Longstaff in that role, he'd be useless at it
Exactly, hard to find a player worse suited to the role.