Thanks! So looks like no reviewer has used that pen yet and all that exists are (faked) videos. The "one day left" preorder is probably shown every day.
The terms-of-service are awful. At least Kickstarter has some safe guards in place. https://thescribblepen.com/terms-of-service/
"Since the payment is processed to be spent on the development and manufacture of the Product immediately upon the submission of the pre-order by you, therefore, it is practically not possible for us to refund the payment you make."