Can't speak German, so couldn't get the post, but can anyone say what library was used in the piece? It's nice enough, but what amazes me is that anyone is really surprised at what can be achieved with skill and a decent sampler. I've been hearing things like this since the days of the Emulator I and that's a LONG time ago...
Once you go 'open', it ought to be made plain whether something made on an instrument is the base library, or third party sounds, as anyone looking to the demo for an indicator of what they might be able to do if they bought one should be aware of this, and the potential cost of adding the extra libraries. Some of them can run to thousands of dollars...
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An arranger is just a tool. What matters is what you build with it..!