That is probably a miner from Nicehash or another giant farm that is pooling many rigs and sending them to Ethermine to mine on that pool.
Here is a screenshot of my workers on Ethpool. I am renting some hash power from Nicehash, 4 GH/s, to help me out on the pool. The reported hash rate for the miner, nhrig, is nonexistent. The current hash rate is 4 GH/s. For some reason Nicehash is not reporting the rate back to Ethpool. I suspect the same thing is going on with this miner you posted on Ethermine. There is no magic button that will allow you to mine at Gh/s speeds with a few GPU cards lol!
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https://ethermine.org/miners/9ec97934c805b703a4dbff308f18be0d7dc798e5
https://ethermine.org/miners/3fb7d56f520903977e15efa6735731bb97f39d64
Here is a screenshot of my workers on Ethpool. I am renting some hash power from Nicehash, 4 GH/s, to help me out on the pool. The reported hash rate for the miner, nhrig, is nonexistent. The current hash rate is 4 GH/s. For some reason Nicehash is not reporting the rate back to Ethpool. I suspect the same thing is going on with this miner you posted on Ethermine. There is no magic button that will allow you to mine at Gh/s speeds with a few GPU cards lol!