Agreed, its existence is implausible, but I assume they're consulting on other projects for Korg Japan in addition to developing Phase8 and other prototypes. They're undoubtedly taking a loss (despite low European salaries) but their contributions across the board could also scale non-linearly.

I also imagine that it's the olive branch that brought Takahashi back to the company after he left. He brought Korg back from the dead and they were probably and rightfully desperate to find a way to retain their top performer.