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.
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[ 2.7 ms ] story [ 22.2 ms ] thread"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.