Ace inhibitors as a potential risk factor for fatal Covid-19
bmj.com
bmj.com
A few days ago there was much discussion on taking ACE inhibitors prophylactically to prevent infection.
The user you linked to is making a more or less informed decision. It would be terrible to recommend their course of action to the entire world population.
But if they want to self-dose, at low, arguably proven-safe concentrations, then that's their business.
Biology is a messy, several-of-orders-of-magnitude more complex topic.
There is nothing you can learn from a one-off experiment like that.
That said, you are correct that they have every right to take whatever drug they want. However, i think it nicely highlights the risk of taking something and having it make things worse.
https://www.escardio.org/Councils/Council-on-Hypertension-(C...