I wasn't talking about current tech, which is obviously not at human levels of intelligence yet. I would still say that our progress in the last 100 years, and the last 50 in particular, has been astonishing. What's preposterous is expecting that we can crack a problem we've been thinking about for millennia in just 100 years.
Do you honestly think that once we're able to build AI that _fully_ mimics humans by every measurement we have, that we'll care whether or not it's biological? That was my question, and "no" was my answer. Whether we can do this without understanding how biological intelligence works is another matter.
Also, AI doesn't even need to fully mimic our intelligence to be useful, as we've seen with the current tech. Dismissing it because of this is throwing the baby out with the bath water.