kamold is right.

The Arteon uses the Indirect TPMS method. You set the pressures yourself manually to whatever you want, and press the button under vehicle information to "set" that reading. You're basically setting the rolling diameter of the wheel. I believe the vehicle will register/learn what the rolling diameter is, and that's your "pressure".

A loss of pressure will change (shorten) the rolling diameter. If the diameter changes "X %" (whatever value they use), it'll chime you with a warning. If you're tyres are "low" (like 28psi) and you pump them up to like 40psi and drive off without setting the pressure - you'll get the warning immediately because there has been a change in rolling diameter.

So with that, I guess it doesn't tell if you if the pressure increases or decreases - only that your rolling diameter has changed.