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Did you see this part in the link you shared?

"The authors of this article, published in 2015, have written a response to their work in light of the COVID-19 pandemic. We urge our readers to consider the response when reading the article. https://bmjopen.bmj.com/content/5/4/e006577.responses#covid-..."

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New to me, but did you read their response? It says "The study found that cloth mask wearers had higher rates of infection than even the standard practice control group of health workers" but they say that health care workers should follow guidance.

standard practice control group of health workers

Would not standard practice be to wear proper masks?

Yes, here we go: "some subjects in the control arm wore surgical masks." And indeed, someone comments "The control arm had less than 1% of no mask use".

The standard practice group includes significant mask wear, so the comparison cannot conclude that cloth is worse than nothing.

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