Auto makers and others are part of the problems with forecasted demand, but there are also larger supply chain issues. Basically every part of the industry, going back to raw materials, is having similar shortages; either because people shut down for COVID or because they, too, underestimated demand during the pandemic.
I suspect it has a lot more to do with failing to properly forecast in general, whether overestimation or underestimation. Supply chains are finely tuned for life as usual and they take a long time to recalibrate.
