The answer to treated vs untreated hypertension right now is that we simply do not know. What we do know is that treated hypertensive patients don't appear to have significantly worse outcomes.

This article does a great job outlining the current state of the knowledge on the subject of Covid/hypertension as well as some clinical trials that should be posting results early next year [1].

I haven't seen any studies that try and tease apart all of the complex relationships amongst various comorbidities, but I think we have seen pretty conclusively that obesity is a very significant risk factor.

[1]https://www.acc.org/latest-in-cardiology/articles/2020/07/06...