Bayern's budget is €7 million euros (salaries are net in Germany). Dirk's salary is only about $9.3 million dollars net. So that isn't actually true. It was a huge exaggeration actually.
€7 million euros = $9.4 million
So the truth is that Dirk's salary is about the same as Bayern's budget, and not "double".
During the lockout, Kevin Durant and his agent even said that 6.5 million euros in net European basketball salary = a max NBA contract.