I suspect the vast majority of Overcoming Bias readers could not achieve the "happiness of stupidity" if they tried. That way is closed to you. You can never achieve that degree of ignorance, you cannot forget what you know, you cannot unsee what you see.

The happiness of stupidity is closed to you. You will never have it short of actual brain damage, and maybe not even then. You should wonder, I think, whether the happiness of stupidity is optimal—if it is the most happiness that a human can aspire to—but it matters not. That way is closed to you, if it was ever open.

All that is left to you now, is to aspire to such happiness as a rationalist can achieve.

So, to be clear, you don't think that such neurohacking as presented in the story is possible?

That said, I think you've found a pretty convincing argument that we shouldn't accept the tradeoff, even if it's available. That is one scary piece of writing.