Wow, -25°C, that's quite a temperature! You're right, the comfort technology should work in those conditions; that's what it's there for.
The temperature at our place didn't drop below -10°. We still went ice skating, though

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Why does the multiple pre-glow function work? I thought it was already pre-glowed for a longer time than the display in the instrument cluster indicates.
Couldn't you simply wait longer after the light goes out and then turn the ignition back on (which would be gentler on the ignition switch)? It's not cold enough anymore for me to test that.
Best regards,
Okay, please provide the German text you would like me to translate.