If false gospels are being written at the same time as true gospels does that mean both are equally accurate? Just because a false gospel writing survived longer than a true gospel writing doesn't mean the false gospel writing is right just because it's older.
But we are talking about the hand copying of the NT texts from originals through centuries. Every hand made copy produces some errors. Every single one, its a fact you can verify.
So in this situation we are talking about - why older does not mean more accurate in any way?