People who say it is impossible to move production from one country to another don't understand what the word 'impossible' means.
That's also the answer to 'can we move production under the sea?'
What I think most people mean is that moving production is impractical, e.g., that there is no realistic incentive that justifies making the investment and so for that reason nobody will make the investment, and production will not move, etc.
It would be more effective to argue that the required investment is smaller than expected, and some particular entity does have an incentive to make the investment after all, etc.
Also it is not limited to electronics - as others have pointed out, Addidas moved automation back to Germany.