That's a straw man, there are many things I don't think technology can achieve. Food scarcity is one of the first, classic things human technology has improved

That's a straw man, there are many things I don't think technology can achieve. Food scarcity is one of the first, classic things human technology has improved through agriculture, and it's reasonable to think it will do the same thing to the high cost of truffles, and indeed the demand will incentivize people to try and reward those that finally succeed at it. If that's bad, then my question is why should truffles be expensive forever?