My understanding was that Moore's law states that the number of transistors that you get <i>for a given cost</i> doubles every 18 months. Hence I don't think any result shown by researchers in a lab can be said to "smash" it until a similar technique is used in production for chips you can actually buy.
This seems an outlier at best; Moore's Law is an approximation, and this falls outside it (as have many). I would say "smashing" the law would be to find some way of manufacturing that would affect the rate of change the 18 months figure to ... 3 months, or something radically different, in perpetuity.
FTA: The experiment was performed at low temperature: about 1 degree Kelvin, which corresponds to about -272 °C (-458 °F). The byte starts switching randomly about once a minute due to thermal energy (heat) at about 5 degrees Kelvin.<p>"low" indeed.
They proved such bits may exist, but have definitely not brought anything to market, nor even demonstrated a process to do so. They used a scanning electron microscope to fiddle atoms around, creating one bit. A science experiment, nothing more.