Yes and no. A single chip cannot have it's weights adjusted, once it's out, it is what it is.

But also, the model weights are in a single mask rom layer, high up in the metal stack. They could manufacture the die specialized for a given geometry of a model up to that layer, wait for updated weights, and then get the final product out in weeks after they got the weights, instead of many months which is what it would take to redesign the whole chip for the new weights.