It means you don't have as much to cool.
Getting rid of 30 watts of heat is trivial compared to say, 300 (I don't quite know how to read that ratio since a 2.5kW SSD seems a little high to me).
Given that 2.91TB SSDs are a common enterprise size, perhaps they're saying the 1x245TB SSD uses 1/84 the power of 84 2.91TB SSDs ;p
Given that 2.91TB SSDs are a common enterprise size, perhaps they're saying the 1x245TB SSD uses 1/84 the power of 84 2.91TB SSDs ;p