Airlines can write what ever them want into them FAQ's. If it is legal is a different shoe.
LH ( and nearly every carrier ) try to squeeze out the customers, and only a very low no. of them even complain or even go to court with them.
And that's the reason, why them come away with that.
If everyone takes them to court, them would never come away with this.
For myselve Iam doing this, and until now I not lost in anything ^ .
But to many people are destinterested or only whining and never do anything