"Absurd" is quite an editorialized part of this headline. Maybe Gizmodo should report on the facts and let us decide if we think it's "absurd?"
I personally think it's reasonable enough. For one, buyers signed on the dotted line. It's a luxury product that nobody needs. They don't have to buy one
For two, nobody likes scalpers.
I don't think any court would award the damages that Tesla would be seeking here but they're well within their rights to try and enforce their contract, and they're well within their rights to ban customers (Ferrari is also known to do this to owners who "tarnish their brand")