You know, the link you provided actually reminds me of something that struck me as unusual at the time I was looking into steroid use. (Now please keep in mind that I have not looked into this topic recently, so I may be misremembering what I read, or additional information may have come out since then.)
What I remember was that we encountered some situations in which people were suffering untimely deaths. In investigating the causes, steroid misuse was detected. So instead of conducting studies to determine if there were circumstances in which steroids could be used safely, they were straight-up banned. (In case it’s not obvious, I’m referring to a specific kind of steroids. Yes, there are steroids used in some over-the-counter medications, but there are not the same type that bodybuilders take to enhance performance.)
To be honest, there’s an excellent chance that the people shown in the OP’s video were using steroids to unhealthy excess. Even the people I know who take steroids have enough sense to cycle on and off of them, to be careful when loading the needles to avoid any air from entering into the blood stream, to monitor the dosage, etc.
I have no doubt in my mind that you will encounter people who encountered health problems because they self-administered steroids too liberally or carelessly. But I do wonder if, given the information available, it’s really fair to conclude that performance enhancing drugs are dangerous in any amount.