Here's the interview: https://www.republik.ch/2020/01/31/nils-melzer-about-wikilea...
tl;dr:
Assange was right about everything that has been made falsifiable: secret indictment, spying on his lawyers, extradition to the US, no fair trial, the whole lot. He's showing every mental and physical sign of being tortured. He needs help, and he's being denied the very rights that western society purports to uphold.
EDIT: and that is leaving aside the whole dimension of Sweden, the UK, Equador, and of course the US making (even more of) a precedent out of him. What this means for the free press, and the relationship between freedom (of expression, of information, and in this case of truth, really) vs national "security" (in this case, the national security to not be held accountable for shooting down civilians) should send shivers down everyone's spines.
EDIT 2 To the people downvoting: care to express which part of the above exactly you disagree with? Do you think it's factually incorrect? How about correcting it then? Do you think it's inappropriate? Why so? Off topic?