Yes I've read about him.
He once told the orphans to sit at the table and give thanks for their meal (there was no meal). As they were giving thanks, a man knocked on the door with plenty of food to go around.
You also want to read about John G Lake, he was another amazing guy.
Praise God, yes for more than 50 years those orphans were fed and clothed and cared for. There was not one instance of their missing a meal.
The point Muller tried to make when he wrote his "Narratives" was that supernatural provision should be the expected norm in the church not a once in a lifetime wonder.
My argument for healing is the same. It is paid for on the cross, it is a place that the church as the body of Christ has yet to get to.