Can someone explain me what does this German law means on English? "Mitteilung uber die Anhaltung von Waren -Kleidungsverfahren- ?

You misunderstood this. You won't be sued for anything. But obviously you have bought a fake product, and the rightful owner of the brand will insist on the destruction of it. You can try to prevent this, but it's unlikely that you will succeed.

If you can't get back your money from those who sold you the fake, it will be lost.