So, you found a reputable doctor who still believes in hydroxychloroquine. That is completely meaningless. Einstein never believed in quantum mechanics, Hoyle never accepted an expanding universe, Behe discredits evolution.
But let's look at some of the studies he cites as supporting his beliefs...
From your link...(
comments in red are mine)
Since publication of my May 27 article, seven more studies have demonstrated similar benefit. In a lengthy follow-up letter, also published by AJE, I discuss these seven studies and renew my call for the immediate early use of hydroxychloroquine in high-risk patients. These seven studies include: an additional 400 high-risk patients treated by Dr. Vladimir Zelenko, with zero deaths;
From where? Russia?
... four studies totaling almost 500 high-risk patients treated in nursing homes and clinics across the U.S., with no deaths;
I was not aware that people diagnosed with COVID-19 were being treated in nursing homes and clinics. I thought all people diagnosed with COVID-19 were taken to hospitals.
a controlled trial of more than 700 high-risk patients in Brazil, with significantly reduced risk of hospitalization and two deaths among 334 patients treated with hydroxychloroquine;
Ah, studies from Brazil whose president, like Trump, is a big believer in hydroxychloroquine. What does "patients...with significantly reduced risk of hospitalization" even mean?
Since my letter was published, even more doctors have reported to me their completely successful use.
Science is not a big supporter of anecdotal evidence - for good reason.
But, I think you should wear a medical bracelet that states: "In case of COVID-19, treat only with hydroxychloroquine".