What I was reading was really just a kicking around of areas that are currently being researched. They weren't drawing any conclusions at all, merely just discussing what mechanisms might be at play, why some people appear to be at a higher risk, why are some having a very mild illness and others are dying.
They came up with three broad areas of severe illness/death - one was ARDS caused by severe lung involvement, likely linked to cytokine storm, the second was a mechanism involving reactions at a cellular level involving ace receptors that causes blood vessels to constrict in particular the pulmonary artery resulting in insufficient blood going to the lungs but with little infection in the lung and the third I cannot remember for the life of me.
The drs view was that oestrogen had some effect on the release of cytokines and so theoretically might make the first type of lung disease less severe where oestrogen was present. In the 2nd case they are looking at whether particular blood pressure medications might prevent pulmonary artery being affected.
The mention of ace 2 receptors in the testes was just commented on, without a conclusion because they said much more research needs to be done. I think they said that they are also present in the kidneys and liver, definitely in the gut and might possibly explain why some people get diarrhoea and nausea, as well as kidney and liver involvement, or that could be due to sepsis or cytokine storm. Again, much more research is needed because at the moment these are all just observations. They don't know if they are significant or not yet.
They didn't talk about the role of oestrogen really either and they acknowledged that younger women are still affected and are dying so oestrogen is no guarantee of a mild disease and again this needs more research.
They were very much considering confounding issues and the need for these to be included or excluded as quickly as possible.