Thank you for taking the time to point out these. I appreciate your feedback and I just made new edits to the article.

For the first question, I'm not aware of any precise statistics. Looking at the figure the observational study provides, it seems that only Hong Kong people consistently wore mask in the previous months.

Second, the meta-analysis also did a subgroup analysis of household vs. non-household group, and mask protection is lower in the household group. I do agree that most transmission occurred indoors and I've written about it here in case you would like to see :)

https://medium.com/microbial-instincts/understanding-the-transmission-of-respiratory-winter-viruses-1c040e57c74