There are many possible reasons why Switch stock is in short supply and artificial supply restriction certainly is a possibility. Other possibilities include poor logistics planning, having to modify or redesign part of the product due to a high failure rate, having to redesign due to needing to use different components due to component supply issues or simply shortage of components.
My feeling is the Switch will get a minor revision due to the dock and joycon issues and that might have caused a pause in production but it's mostly about Nintendo still being unsure whether the Switch will have a huge drop in sales like wii u so being conservative with shipment numbers which also means artificial scarcity I guess. This has the benefit of less unsold inventory and keeping consumer demand higher. I remember the wii u being cleared from Tesco shelves as they weren't selling and them downsizing their Nintendo shelf space. It was hugely damaging for this to be going on across retailers and quickly established the wii u as a huge failure. Clearly Nintendo did not want to repeat that mistake.
