DAAs must inactivate CB1 because receptor CB1 is crucial for fibroblast activation.
No, there is no evidence of inactivation of CB1 by DAAs. There is evidence that DAAs destroy the Hepatitis C Virus and that the absence of HCV reduces up-regulation of CB1.
Inactivation of CB1 exerts potent antifibrotic effect.
No, but there is evidence that "CB1 inactivation has been shown to inhibit the progression of fibrosis" which differs from your claim of a potent antifibrotic
On the other hand Hepatitis C Virus up-regulates the Cannabinoid Receptor 1
Agree. See point 1 above.
I've seen one case of Peyrone's caused by interferon.
Err, no. I suspect you have seen one case of Peyronie's disease coincident
with interferon use and have jumped from effect to cause. Available scientific evidence is currently contradictory regarding any link to something that effects up to 5% of the male population anyway.