Interesting to note that it is a discussion of models and general implications, but is not actually a study of itself.
For example, the seafood and chicken processing plants had a 95% asymptomatic rate among the infected.
I would love to see some studies which compared this against rates that are normally seen for the same age/gender/heath ect.
Similarly, how do these observations fit in to the greater picture. Are there other processing plants that used masks but had higher rates of symptoms?
Also, another way to view this data is that perhaps we are vastly underestimating total number of asymptomatic cases overall due to reporting and testing biases.