Hilariously enough, the only one who really knows he works for F.O.W.L. in canon is Launchpad. (Or, well, the remnants of British!Launchpad inside his thick skull.) Knowing Steelbeak though, he might accidentally let it slip at some point or another. Until then, there will be incredible moments of him pretending not to be one of Scrooge's new enemies and instead being a 'fan'.