gzg, it's called PRACTICE, and LOTS of it. Since those 2 years ago, I shoot every other day usually, and on the typical week I shot 3-400 arrows. I don't shoot that many in a week now, but I did for a long time. Do you doubt that in 2 years with diligent practice a feller could improve that much? Oh, and a dramatic upgrade in equipment. It all makes a difference.
You're still not judging, right?