Although I do not think Matt was disrespectful, to tell someone who's build, which already took a unfortunate direction, is a "waste his money" is like kicking someone who is already on ground. Itzgoten obviously has a lot of pride in what he is doing with his Z, and took the time to share something new on this site. Some people love to do something different, and I would never say they are wasting their money if it is what they believe in. He is the first to admit he overlooked a few things, but I would not recommend him to go through 6-8 motors, especially if he does not like to get his hands dirty. His mistakes and corrections may lead for another person's SR20 build to be successful.
His brother's shop is reputable in the area, and does not need to be reevaluated. Everyone makes mistakes, regardless if it it was his or the shop.