In this case, the Tesla has some market value so you can recoup most of the cost. What the Sunk Cost Fallacy is dealing with is situations where them funds cannot be recovered. If you read some of the examples in the link I provided it will help you understand the concept.
In this case that started the thread, the OP stated he spent $972 on Tivo service fees. That money is gone and cannot be recovered. So in looking to change his configuration the Sunk Cost Fallacy would state that $972 has no bearing going forward on making a rational choice. The fallacy would hold that continuing to pay service fees on a service you are no longer happy with just because you “invested” so much in fees in the past is an irrational choice.
Hope this helps.