What about the assertion regarding how much of the profits are taxed in the US?
I haven't seen an explanation of where that 0.005% number comes from, but I would be unsurprised to find similar forms of confusion in it.
That's not the same thing as saying it was "a 0.005% tax rate". The issue is over what fraction of the non-US profits are taxable in Ireland, not over the tax rate.
The profits would then be the difference between the cost they bought those products for (+ things like the very substantial payments to Apple US for R&D), vs what they sold those products for.