Also, at https://c19study.com/boulware.html, a study where the authors themselves say that they found to prevention of COVID-19 cases, the site tries very hard to spin the paper into positive results nonetheless. Some of the numbers cited, especially the primary claim that "COVID cases are reduced by [49%, 29%, 16%] respectively when taken within [2+, 3+, 4+] days of exposure.", are not sourced or explained properly. I can't see any data in the paper regarding the effects of interventions taken within 2 days of exposure, so I find it hard to believe that this is somehow derived from the paper's data and the authors just missed it.
I didn't look at all the other studies, but if most of the "positive" ones are similar, then I trust HCQ and its supporters even less than I did before.