Exactly, there is no data, to support some of the statements I have heard him come out with during interviews. The serology studies carried out in a number of locations suggest the number of people already infected is no where near 50%. IFR from 0.6 to 1.2%. The serology studies may be wrong, they may not be the best way to detect who has already had the virus and there are challenges with them. I hope they are wrong and I hope WAY more people have had this than we think, that would be really good. However there is no data to support that as yet.
As for the hydroxychloroquine..... the studies carried out on the use of that have not been good. Given way to late, without combination with azithromycin and zinc). No idea if it would work but the zinc has been reported to be crucial yet I haven't seen a single study in a clinical setting which has used it for some reason. I'm not going to get into a long description of how/why hydroxychloroquine is being touted as causing cardio issues. Just to say, there has been, as far as I can see, no FDA warnings for this when it is used as an anti malaria drug. Maybe when used in certain circumstances? Higher doses? Anyway, any intervention to stop virus replication has to be done EARLY. Same for an antiviral drug. Remdesivir has been approved in the US with basically no evidence of a benefit, but I'll not get into that here.
As this is a good news thread I will share the following link. The article can be accessed by free sign up or you can just watch the vid (from Prof. JoAnn Manson at Harvard) in the link describing a link between vitamin D deficiency and severe symptoms/disease in Covid-19. There have been plenty of other articles around this too.
https://www.medscape.com/viewarticle/930152?src=soc_tw_share
in short, get out in the sun, get some oily fish down you, and consider taking vitamin D supplements (check with your GP, I am not a medical doctor). There have been other studies on vitamin D too and Dr John Campbell has been discussing this for a good while. Below is a link to his latest video highlighting the Prof Manson study.
If it does help then it could be a simple way to help boost the immune system for a lot of people (many people will already have good levels).