First of all, your 'Hong Kong' study is from May, 2020, while the sources I've presented are a year later with upwards of 100 references or more in them. The attached JAMA article has a summary table of several such studies that all show remarkable mitigation benefits vs COVID-19 when masks are used...here are some more points to ponder...
>While masking alone will not stop all transmission of COVID-19, it will definitely impede that transmission...even if only to a small amount with cloth masks, or a much greater degree with N95 masks like we should be using now in the face of the Omicron variant...while the following PNAS MIT Report originally provided by Baron predates Omicron, the relative performance of masking types is shown to be dramatic when dealing with an airborne pathogen.
https://www.pnas.org/content/118/17/e2018995118
>More emphasis needs to be put on the word "Mitigation"...people should think of masks as a means of "slowing down" the spread of COVID...not absolute protection. Slowing the spread of a deadly airborne pathogen is a GOOD thing and it definitely REDUCES the number of people getting infected...and fortunately, it's very easy to do...can you not agree with that?...why would you not want to use a simple and inexpensive tool like a mask during a pandemic?...why do you fight this?
Link: https://jamanetwork.com/journals/jama/fullarticle/2776536