Scientific study published in two journals turns out to be be flawed and suspicious is this a Big Pharma fraud to favour another treatment, vaccine or even undermine Trump

Scientific study in two medical journals declaring danger of Hydroxychloroquine (anti-malaria drug being trialled and used for Covid-19 treatment) is now being flagged as unreliable and suspicious. Is this a conspiracy to favour other Big Pharma treatments/Vaccines or even to undermine Trump's credibility as he has promoted Hydroxychloroquine?

https://www.sciencemag.org/news/2020/06/mysterious-company-s-coronavirus-papers-top-medical-journals-may-be-unraveling