One of these "studies" is a 2-page Google Doc with no real data. Another is the discredited Raoult study, which is under investigation by the journal [1]. Another study cited is also by Raoult's team. The Brazil study (ref. 29) doesn't seem to have passed peer review (yet?) and has severe methodological flaws. Like the Raoult studies, the Brazil study was not randomized, but makes no attempt to control for confounding by indication or self-selection, such as with propensity score matching or similar methods commonly used in observational studies. The last study cited isn't a study, but an article from a local news station.
That's a study of other studies, not clinical work in its own right. That's the academic equivalent of being a blogger. The title, "Early Outpatient Treatment of Symptomatic, High-Risk Covid-19 Patients that Should be Ramped-Up Immediately as Key to the Pandemic Crisis", sounds like a political statement.
The real argument there is "It appears that the FDA, NIH and cardiology society positions have been based upon theoretical calculations about potential adverse events and from measured physiologic changes rather than from current real-world mortality experience with these medications and that their positions should be revised." The author is arguing that while this drug combination does cause measurable heart damage, it's worth it because the overall near-term mortality decreases. That may or may not be justified, but it's a much weaker statement than the paper title would suggest.
Some of the citations are a bit strange. One is to a letter on Google Drive.[1]
[1] https://retractionwatch.com/2020/04/06/hydroxychlorine-covid...