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This post by Loren is really an oversimplification almost on the edge of "malicious intent".
First, reprogramming an ECU is not that simple if done properly. Even old systems like the Motronic used in 3.2 rely on 3D maps tying several variables simultaneously. So, you dont change a value here and there, you have to change many at the least, then you have to verify on the dyno (and road) and repeat...
Second, it should come as no surprise that sometimes the gains are significant. Porsche, like any manufacturer, tunes the engine to accept a broad range of gas quality, and always with emissions control in mind. When you're tuning, usually you can afford to forget about that, so with much less constraints, it's no wonder you get better results.
Third, dyno tests (for power and torque) are not everything. Something that can be improved (and usually is) over the factory spec is engine response / "revability". Specially in the older days, quick throttle response meant more emissions. If you care less about emissions, this too can be improved.
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