They are mechanically simpler because they don’t have hundreds of parts in a combustion engine and an automatic transmission, but their overall complexity is much higher.
You have all of the electrical system out of a modern car(fucking complex) with all of the systems needed to handle the electric motors and batteries.
It is the different between a flip phone and a smartphone. The smartphone isn’t simpler because it doesn’t have as many buttons or a hinge.
To be fair, he did make the area safer. You can argue with his methods, but you can’t deny the results were positive.