I think Blow's comment was actually quite relaxed and neutral. He just stated it's not a big help for making a next game.
Insane that people are putting him down as some sort of entitled asshole regardless.
What's insane is that people are pretending it's somehow illegitimate to bemoan one's product being pirated. Yeah, it's a thing that happens, but since when is that a reason to avoid discussing/acknowledging/pushing against something? Why does Blow have to walk on eggshells to express negative feelings about The Witness being pirated?
Now, it's true enough that some developers have exaggerated the affects of pirating, and used it as an excuse for bad practices. That doesn't mean, though, that piracy simply has to become something everyone happily accepts.
I also don't understand all the "The Witness has been priced out of the market" comments. I mean, do people even know what that means? When it's so easy to pirate, a lot of people doing it hardly means there isn't also substantial demand for something at whatever price point. I'm sure there are other heavily pirated games people making the "priced out" argument would have been happy to pay full price for. You can't say a game that's currently a top 3 seller on Steam has been priced out of the market - that simply doesn't make any sense.
Besides, whatever your perceived value of the game, why is that suddenly a huge point of contention now? The Witness has been in development for many years, by most accounts is superbly put together, and provides dozens of hours of entertainment. You may not personally care to pay $40 for it, but what makes this distinct from you not being willing to pay $60 for, say, a AAA game by a developer you don't like? Is there really something specific to this situation that makes you especially sensitive to the price, besides your preconceived notions of how much an indie game should be sold for?