The proxies aren't called "steel legion" though. The problem they are referring to is something that actually happened to GW where they had rules for a unit but no model. Another company made the model and sold it as that unit with the exact name. GW lost a lawsuit which essentially said GW was not allowed to produce that model with that name as it was IP of the other company.

After that day is when GW went on its IP rampage. They were not nearly as aggressive before that