if they keep releasing bombas whos gonna hired them again?
They already released sales failures when they were on contract with Sega and still keep getting contracts.
Since you're basically predicting Scalebound to be a bomb at this point, here's the hypothetical: if most of their games are sales bombs, regardless of platform, then maybe it's not a platform-specific issue at that point and we don't have to make it one.
And if Nintendo is the publisher of this game, they're still willing to give Platinum money after not one, but TWO sales failures. In such a scenario where Nintendo were concerned in that regard, the lesson should have already been learned. So if Nintendo is giving them more money, it tells me that they acknowledge the sales limitations of Platinum's games and don't really care.
Again, not rocket science.