I don't doubt that anonymous transactions are possible, I want to know if they're actually accomplishing what this person is claiming. They've had plenty of time to do so.
I think it's unquestionable that privacy is generally helpful to victims (or rather, the victimized.)
I think what he might be referring to in particular is that the traditional blockchain and even financial system at large is incapable of protecting at-risk individuals (eg activists), as the former is subject to chain analysis and the latter is subject to the whims of whichever regime has taken power.