That proves nothing. Once again, they have no central fiscal control. Therefore, by simple definition, they cannot be a federal state.
The EU has certain limited fiscal powers. It has a role in deciding the level of VAT(consumption taxes) and tariffs on external trade. It also spends a budget of many billions of euros. There is furthermore a Stability and Growth Pact (SGP) among members of the Eurozone (common currency area) intended to co-ordinate the fiscal policies of member states. There's more, but I reckon that's enough.
The centralisation of fiscal policies (and other elements) varies between federations. In fact. not all federations even go by that name. It's not a rigid definition.

