That is yet another brain dump site IMO. The product guarantee means nothing. Obviously if you are given the actual exam questions and answers it will be difficult to fail!
There is no company information. The Chinese connection is a tell-tale sign - they are outside of jurisdictions where action could be taken against them for providing brain dumps in violation of
test agreements.
I've said it before and I'll say it again: a 12 year old can produce a "professional" looking website these days. It doesn't mean anything.
You'll notice the text under each product certification is identical and uses a simple template approach to replace just the keywords for the exam.
It's obvious to me that this site is not reputable but I've been in the business a long time. You may wish to take a different view. I'm willing to make a wager it is a brain dump site so if you proceed to purchase any of their products let me know!
Good luck.