There are at least several other sources talking about this, from more than 20 days ago. Try to google the spanish word: Cloroquina
https://www.ncbi.nlm.nih.gov/pubmed/32147496
https://gacetamedica.com/investigacion/covid-19-el-fosfato-d...
https://www.sadi.org.ar/novedades/item/931-covid-19-uso-de-c...