I just got through it.
The gist of it is that someone sets up a corporation in an offshore tax-advantaged area and that corporation owns their assets, and whatever income they earn here which would be subject to tax, they have the offshore corporation provide "services rendered" and they send their income (here) to the offshore corporation as "payment".
This goes right to the top; the article mentions how somehow an enormous percentage of Apple's worldwide earnings are somehow incurred by what would otherwise be their insignificant office in Ireland despite much of the costs (research and development, etc) being incurred in the USA. Who pays for this? You and I, of course. People who aren't rich and/or smart enough to be able to do stuff like this. That scumbag who was the subject of this article, was spending more every month on lawyers than the average person's total net worth.
I know one or two things about mechanical gadgets and contraptions but this sort of international monetary tax scamming strategies are beyond my comprehension. My little pile of loonies (that which I didn't spend on bikes) is all sitting in Canadian accounts, completely exposed to me having to pay income tax on it.