Perhaps, but the Niteroi's are getting to the end of their life and Brazil is going through a difficult economic time, so some times you put differences aside.
Besides, while Embraer is making noise like they are mad about the loans/funding to Bombardier, you may have noticed that the Brazilian government is not picking up the fight, except in the most subdued of ways, as it probably is getting the advice that there is nothing against the international commercial rules going on and they would lose (especially if their own participation in Embraer came to light ). Moreover, Embraer and the government of Brazil know that their competing airplane is not as technologically advanced (and in particular nowhere near the fuel economy and silence) as the C-Series and that the contract was won just as much on technology as price.