The article is biased (Musk sleeping at the factory is something bad) and has incorrect information (Musk did not reach targets).
It is to be expected that consumers cancel since it takes to long to get their new car. This does not mean that that hate Tesla. They are disappointed that they cannot get their dream car today.
Probably also a lot of people who were banking on a $27,500 car and are unable to fork over the $49,000 that is more likely with a premium interior and expiring tax credits.
Most consumers don't pre-order their car anyway. Their car dies, or they get tired of dealing with their car, and they go to a dealership to buy something that day.
It is to be expected that consumers cancel since it takes to long to get their new car. This does not mean that that hate Tesla. They are disappointed that they cannot get their dream car today.