Yes, he certainly knew his stuff with turbos.
He disappeared completely for a while, not even answering his phone from what I understand. He was on a lot of other forums and facebook groups that I visit and disappeared from those as well.
Whilst bimmersport can get a little unruly from time to time (see above...) some of the Facebook groups are just brain damage, for every half intelligent post on there you get a hundred posts of "nah g, my cuzzie did it for half that price and it's all gudz" or some rubbish. I think it was that kind of thing that really got to Steve, and in the end he said, and even posted somewhere I think, "I've got more than enough business to keep me busy, so I don't need to keep arguing with Facebook experts" which is fair enough.
The word of mouth reputation for Steve and his existing customer base will keep him more than busy, but as you say its a shame his advice that he was happy to give free of charge is no longer available.