The shift described in the article is more about craftsmanship vs mass production (Ford's conveyor belt and so on) and disruption is not the right word as it took place over decades. Most people that started as coach builders could probably keep their jobs as fewer and fewer people started.
There were some classes of combustion engines that smaller shops did manufacture, such as big hot-bulb engines for ships and factories. Miniaturised combustion engines or electric motors are not suitable for craftsman-like building but rather standardised procedures with specialised machines.
The main mechanism is not "disruption" but rather a trend of miniaturisation and mass production.