When looking at time scales, artificial intelligence comparable to even an average human is likely to be centuries away due to the complexity involved. Silicon solutions are not scalable for making the number of connections and managing them over time. Taking a shortcut using biology is going to require years or decades of training as we incrementally improve the training process. None of that is going to be completed within our lifetimes, so being dismissive of it is completely reasonable.

It is as impossible as cloning fully grown adults with all their memories, like sure we can do it eventually once tech reaches that point but at this point in time me calling it impossible won't be disproven before I am worm food.