That the wealthy are using the system to benefit themselves is, sadly, not news, although the scale of it continues to be staggering. Tony Blair doesn’t help himself. I can’t think of other leaders who were really popular in office but totally shredded their public image in retirement.
Looks like the parts of this that are important were already well-known, and the parts which are new are unimportant. I mean, even if I were a Russian, I wouldn’t much care that Putin is secretly supporting a bastard kid. If anything, it’s more admirable than siring a bastard kid and then leaving him to fend for himself, which would have been my default assumption. Rich people hide money offshore to avoid taxes? That’s something that we should care about. And I imagine that the relevant people already know all of the details about exactly how they do it.