Sorry, but I read that same study. You missed an important point in that study…the L type was much more aggressive…and the study shows it has mostly died out now. Probably because it was so aggressive it made itself know quickly allowing the Chinese to effect quarantine faster.
But,that isn’t good news. The S type is much more able to spread because it stays under the radar for long extended time periods. We are seeing cases that clearly show this has been moving in the population here for at least 6 weeks.