IMO is scam. If not scam, you will get similar products but certainly not was they claim to have.
a) there is a morphinian product on the site. Any morphinian is banned in china.
b) Isotonitazene - and no other eto analogues? Just a hook because they know people would pay whatever for real Iso, especially street dealers that could make literally millions of USD by selling it as fentadope or synthetic heroin. Iso is scheduled in the same list of Fenta in USA and soon will be banned in china as well. There was only 2 batches of Iso, 2 years a go, and no more was made neither they intended to make any other batch, seen all people who died.
So for me 99% is scam, if not scam, for sure you will get just mixed analogues of whatever.