Since (1) presumably that study includes people both with and without symptoms at those times (they don’t elaborate on methodology, so I assume they took everyone) and (2) being symptomatic makes you much much more infectious,
I would therefore take those numbers as rather serious overestimates.
Since (1) presumably that study includes people both with and without symptoms at those times (they don’t elaborate on methodology, so I assume they took everyone) and (2) being symptomatic makes you much much more infectious, I would therefore take those numbers as rather serious overestimates.