Well there is some truth, if the new calipers were fitted and lines connected at the same time as old calipers were removed .
The set up,you are fitting is gre same I have just taken of my car.
I had a hell of a job bleeding them , it was alway ain’t in my system , and when I did get a peddle it was 1’’ off the floor, hence I mensioned earlier I had to two tap the brakes every time .
I had no booster and 1’’ master .
What master do you have 1’’ or 1.125’’ (1 1/8’’ )
If you are still soft on the peddle bleed it again