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From briefly reading the article, it mentions that he increased the displacement to 3.2 liters and he's also running fairly high compression pistons for a modded TT with aftermarket pistons. 8.5:1 is the same ratio as the stock ones, usually people put in lower compression pistons when they mod their car. Lower compression pistons allow you to run more boost, but you'll get less HP for a given boost level, while higher compression pistons will give you more HP at the same boost level, but there's a greater chance of detonation, so you can't run as much boost. Since he has both high compression pistons and more displacement, then getting those numbers from those turbos is possible. In addition, having an engine management system helps also, since he probably doesn't have his A/F ratio running as rich as a JWT ECU would run it. We also don't know what the specs on his turbo are. By using different wheels in the turbo, you can vary its performance a lot.
As a side note,look at his HP and torque numbers. Although it says he has an 8000 rpm redline, he has more torque than horsepower, meaning that his torque peak is below 5250 rpm. If you look at a car whose engine is meant to rev high, the HP will be a lot higher than the torque because the torque will peak way past 5250 rpm. He might have an 8000 rpm redline, but his engine will run out of steam long before then.
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