Semantics for sure. But truly... many people reading this have no clue that "server infrastucture" does not necessarily require programming changes. Servers are the roads... software the cars. I do not see where they said changes would need to be made... I see:
Make the old wow version work... let that sink in. We ARE getting Vanilla.. the old wow version. YAY!"But now we think we have a way to have the old WoW version work on the modern infrastructure and feel really good."