How can you sure this is not a scam? Unknown seller from china, domain registered 2 months ago, seller offering only one product in addition of a case...
Even if this is legit, I will never buy a 629$ card with almost no warranty and no idea about quality on components / cooling.
I think the site is made by an active Redditor, cause I see his posts often in mining subreddits. Don't think it is from China.