Gigawatt is somewhat trustworthy, and that product listed seems to be a generic product I have seen at several Chinese vendors, so i think it exists.
The ETH Hashrate seems in line with p106 but they ETC hashrate is weird, should be same as eth.
Also no way in hell are they getting 800+ on XMR with those GPU's, so the numbers look a little off.
Well, eth have a bigger DAG size, that's why hashrate is bigger.
And about XMR, that was first thing I start to be suspicious, there is no way to achieve this hashrate.
You can get half of those card. So I wouldn't buy this stuff at all.