I think if they counted it like they do ‘automotive industry’ jobs there would be 10x that many.
Many others are going to be like this. Pump manufactures will unlikely make pumps only for the oil/gas industry. They will have specialized models, but many components will be used for a different pump in water or other services. Not to mention the oil company will also buy water service pumps.
There is no doubt there is lots of spin-off employment when a significant increase in energy production occurs in the area. Heck, even the laundry folks and fast food hire more workers because of a boom in the Bakken and Eagle Ford.