I mean the author of the manga But now that I look the only mention of Tsubasa I can see is in the Pop Culture References section which states that the beginning of episode  is a parody of Captain Tsubasa The way it reads currently it is definitely synthesis but if its true theres bound to be a reference probably in Japanese confirming it If none can be found though it will eventually have to be removed and I personally question why it merits mention in the first place anyways  it seems very trivial to me