The paper cites this website: https://covid19.healthdata.org/global?view=mask-use&tab=trend https://covid19.healthdata.org/global?view=mask-use&tab=tren..., whi

The paper cites this website: https://covid19.healthdata.org/global?view=mask-use&tab=trend https://covid19.healthdata.org/global?view=mask-use&tab=tren..., which reports 60% (self-reported) of people consistently wear masks. "Required" isn't the same as followed. Furthermore, I think this paper is modeling COVID19 deaths everywhere, not just in dense areas.