That doesn't prove that Hydroxychloroquine is not effective. Aquarium cleaner is NOT malaria pills.
COVID-19 doesn't attack the lungs. It attacks the red blood cells, by making it lose the ability to carry Oxygen, and CO2, in and out of the lungs.
It definitely
infects the lungs, at least in severe cases. That causes an inflammation response, which makes it difficult to get enough oxygen.
Whatever the details are, it's bad news.
COVID-19 is NOT, primarily, a respiratory sickness. The breakdown of the lungs are the effects of the attack on red-blood cells.