French target trial using obs data of HCQ vs not in SARS-CoV-2 infection

I have read through this observational data emulated target trial and would be interested in what the methodologists here think of the study. I personally like it and only found small quibbles with it. I think the conclusion is right and I suspect it will bear out in the prospective trials that are currently running with HCQ not showing any benefit in the end. In this article, it seems like the authors were pretty careful about how they set their analysis up.