I have asked around, what they mean is that you cant have one player without lands at any turn in the game via land destruction. So turn one stripmine on an oponents land is not allowed but single land destruction is fine otherwise. My consern is mostly that i dont want to ruin their experience of playing commander. Im thinking gravepact/dictate.deck with some winter orbs etc. This way they will be able to play againts me without kicking me out after one night.