I have been reading this guy for many years and tend to believe him more than the "Belarusian opposition journalists" (Belarusian opposition can exist only outside of Belarus or inside mother earth).
What I think happened, after he was released by Azerbaijan he decided to make as much profit out of this story by generated hype as possible. And wrote the fairy-tale about this jail. Don't get me wrong, those jails are bad, but things that he says in the story are simply not true.
Jails are bad in any country, read here about American jails if you think Belarusian jail is bad:
romanvega.ru
10 years without trial, how about that?
The point of sources is to separate reality from what some guy on the internet thinks happened. I believe you are being deluded or disengenuoid in this thread.