Do you apply that to Winston Churchill as well?
of course, he wasn't perfect but the quote does say 'almost always'.
His wartime leadership was conducted under extreme hardship which makes Zelensky look similar in stature (but without the champagne habit).
As for Lord Acton - perhaps not prescient exactly, more a man with an understanding of the human condition when handed such great power. Also he recognised that toadying supporters who are oblivious to moral or legal conventions are needed to facilitate such corruption by power. Does seem kind of familiar.
My post was just a comment, just about on topic, not intended for forensic dissection.