it may prevent the need for a TMZ or RMZ
That's not up to logic. I agree with @tescoapp so far: if this MLAT stuff is to work, every plane needs to carry an active transponder (though I don't understand from the given text it needs to be mode S, but that's a side-point). So a TMZ would in fact be required to make it really waterproof. Otherwise, it will never offer more than suggestions.