I didn't see anything in this article where the author explain how offshore money corrupted democracy. He also throws out the Koch Brothers as some kind of left-wing talisman, even though I haven't seen them implicated in the Panama Papers.
It is certainly possible that offshore money could be corrupting democracy, but I don't see any evidence in this article.
When I was at school, we used to play a game in English whereby we each had an obscure word that we had to get into compositions as often as possible without the teacher spotting it. The record, if I recall correctly, was something like 6 mentions of chiaroscuro.
I sometimes feel that Guardian political journalists aren't paid by the word but using some form of buzzword bingo similar to the game we played. So the more times they get terms like 1%, neo-liberal, progressive etc the more they make. Polly Toynbee is definitely the master at that but Chakrabortty is pretty good too.
It is certainly possible that offshore money could be corrupting democracy, but I don't see any evidence in this article.