They don't have any negative feedbacks and so I never feel that this is a scam site.
How do you feel that it is a safe site? Are you one of them?
It seems that you didn't read the whole page of the link you posted above better read the comments below of that link.
I tried to search on neraex exchange about restricted countries on their support page but it seems there is no article or announcement about this.
According to the link you provide above they are not registered with the local authorities which means they are anonymous.
Their whois registrant location:
Registrant Contact
Organization:Domains By Proxy, LLC
State:Arizona
Country:US
How you can trust this site?
For me, this exchange is not safe to trade so I don't recommend people to use this.
Another people telling that this exchange is a scam from here
http://www.shitcointrading.com/en/neraex-pro/ check the comment on the page.