I don't have detailed information about Sionstore due to lack of information from Google search, I think this is a new project that has met the target amount of money and then left. Very disappointed in this pandemic situation, there are still many scammer projects to deceive investors while still experiencing economic difficulties.
I have stated in my previous reply that an exchange called Apoolex has recently changed his brand name to SionStore, after being accused to be a scam. It pretends to be an exchange platform but we can't find it listed in any rating platform like Coingecko or Cmc. As you have just mentioned that search engines can't recognise it. It seems that it has been created to promote scams and convince users in order to deceive them.
I invite you to check the links mentioned in my previous post.