This article is weak. No sources, no papers, nothing other than a claim without one scintilla of evidence for that claim. Given what I posted below, the claim sounds very unlikely, although until we see the data from the study referred to in your link, I guess it's possible it could be true. However, I'd suggest posting more reputable articles/links. This is somewhat reminiscient of the unattributed/unlinked screed on iron/porphyrin and HCQ you posted on 4/9 from that nutjob jarasan's blog, especially since this "article" is circulating like wildfire on far right wing sites.
I'll stick with what the Lupus Foundation of America has said below in italics.
https://www.lupus.org/blog/are-people-with-lupus-protected-against-covid19
"There is no evidence that taking hydroxychloroquine (Plaquenil) is effective in preventing a person from contracting the coronavirus (COVID-19). People with lupus should follow the guidance of their doctor and the safety guidelines being issued by the CDC."
In addition, a recent communication, excerpted below, shows that (in a small study) the frequency of lupus patients with COVID-19 is much higher than would be expected vs. those with RA.
An initial analysis of patients included in the COVID-19 Global Rheumatology Alliance registry shows that 19 (17%) of 110 patients with rheumatic diseases who have been diagnosed with COVID-19 as of 1 April 2020 were patients with lupus.2 The frequency of patients with lupus who have been diagnosed with COVID-19 was overrepresented at ~50% of that reported for rheumatoid arthritis, a disease that is ~4 to 8 times more prevalent than lupus in the adult population in the USA.
https://ard.bmj.com/content/annrheumdis/early/2020/04/24/annrheumdis-2020-217656.full.pdf