That study absolutely does not prove causality, in fact it clearly states that RCTs are required to ascertain if causality can be demonstrated.
That said, I have launched a new range of secret ingredient sugar pills that won’t just protect you from Covid, they also work against cancer, mind control rays, alien abduction and ingrowing toenails. Naturally, I’m not allowed to make these claims on the packaging or anywhere else (because of the global conspiracy and lizard people) but take it from me - they’ll sort out whatever your problem is. I even have a fictional doctor supporting them on YouTube and everything. Send me PayPals and nudes. Mainly nudes.