I take issues with a few points in the article.
The first is that they're suggesting the R0 is 2-3. I've seen new estimates placing it at 4 or above with the current information that many people remain asymptomatic for the duration of the illness, meaning it's spreading more readily than previously assumed. I also wouldn't trust the percentage of inter-household infection rates stated by the CDC unless they've confirmed them via testing. If they're basing it on symptoms alone, then that's no good. I know multiple people who have been ordered to self-quarantine based on symptoms within the last week who were denied testing. It's still very hard to get access to testing.
Second, they're making the contention that aerosols are primarily emitted through coughing and sneezing. This has been studied in influenza (which has a lower R0 than SARS-CoV-2) and neither is necessary for aerosol transmission.
:When the team analyzed the samples, they found that a significant number of patients routinely shed infectious virus—not just RNA particles—into particles small enough for airborne transmission. They were surprised to find that 11 (48%) of the 23 fine aerosol samples acquired when patients weren't coughing had detectable viral RNA, and of those 8 contained infectious virus, suggesting that coughing isn't a prerequisite for generating fine aerosol droplets."
Third, we know from scans of the lungs of confirmed asymptomatic COVID-19 patients that their lungs show abnormalities. Lower respiratory infections in the absence of URT symptoms suggest inhalation exposure as the source of infection, not contact exposure.