No.

There's no mention of previous balances.

If it's a brand new exchange, why would anyone use a brand new exchange?

If it's a straightforward scam then the purpose of this site is to harvest your Wex.nz login details in the unlikely event of the real Wex coming back and/or using your email and login on Wex.nz to attempt to get into all your other crypt related accounts with the same details.