That's just not accurate (from the exec summary in the cited paper):
"Face coverings can be effective in contributing to reducing transmission of COVID-19 in
public and community settings. This is informed by a range of research, including
randomised control trials, contact tracing studies, and observational studies – assessed
most recently by UKHSA, described in a review conducted in November 2021."
The article itself is referencing whether school transmission is impacted.
