The laws are the laws, and the LOTG section on VAR requires the option of a screen if the referee deems it necessary (either to confirm the VAR's suggestion or to aid credibility). The FA may have made suggestions regarding how they'd like the protocol to be implemented (ie. use the screen as little as possible), but they can't go against the way IFAB have said VAR should work. And so, even if the FA were to instantly ban any referee who used it, there will always have to be a screen available.In case of an extraordinary incident where to aid credibility it would benefit the referee 'reviewing' the screen