If Koshiro knew it would get pirated, there's no way he would've released in on steam day one. He’s been working on this game for years. Now he's going to lose tons of money on it. Sure, the hardcore goobs, and consumers of youtube chud will buy physical copies, but there are thousands of gamers who will just download teh rom and be done with it.
He may be a great game developer, but his business sense is off. Or at the very least, he was blind to the rampant piracy that dominates the "retro gaming" industry. Perhaps that isn't as prevalent in Japan, I don't know. But if no one on his team warned him about the inevitability of it, he's surrounded by yes men. And if someone in his circle did warn him, and he disregarded it at the incentive of "steam money," he's just oblivious to how things work on the internet.