They use transistors like CPUs and RAM so yes. It's a bit like the increase in areal density that hdds get. This is what lets us go from 250GB per platter drives like we used a few years ago, to the "monster" 1TB per platter drives that we have now. Pack the bits tighter together, get more space on the drive. In the case of SSDs because there is no platter, this is done with smaller transistors.
What I wonder is how much an issue this is. For desktop users it doesn't matter much. But losing the enterprise drive might be an issue for business's? That and does the size of the transistor really matter? For example, couldn't they just make a 710 series with the newer 20nm transistors? But keep everything else the same so businesses that need a direct drop in replacement could get one? Smaller sized transistors it might even get a voltage/power drop. I would think it wouldn't matter much if they need a new SSD then they could just buy a newer 20nm drive. But I don't buy enterprise type drives so I'm not sure of the requirements.