My Garrett GT35R turbo looked like that after 60K miles (from new) on an old project of mine. The turbine blades were in A1 condition. Modern turbo engines run leaner than the 80s gas guzzlers.
The ED30 has EGT (Exhaust Gas Temp) backup where the ECU will shove a load of fuel in if it detects excessive exhaust temps, but check for EGT related fault codes just in case.
If you can get hold of VCDS (formerly known as VAG-COM), log the following blocks and go out for a 20 minute drive: "Lambda Regulator", "Lambda requested", "Lambda actual", "MAF", "Boost requested", "Boost actual" and "Ignition advance". Paste into Excel and then upload to here. I will be able to tell you from that if you have a problem or not.