Stay away from it. Seems bogus.
I just put in a random domain off a TLD that I own, and it comes up as $9k. LOL, you can literally reg it for less than $15 at Porkbun, Namecheap, or Encirca.
Looks like they will take your domain, register it themselves and then resell to you for thousands.
Who control the right of the dot available to be offered?
Right of the dot is controlled by the registrar, the actual TLD is owned by the user that owns it. The owner loses control for a time once it is submitted and accepted by a registrar, but gain a percentage of profits from every SLD sold on it.