Here's the link on archive.org.

A: That may be but I doubt that huge number is significant relative to the approx. 280 million vehicles currently registered in the US or even the approx. 12 million new cars sold each year, so it is basically a rounding error. I looked here and it mentions America exporting about 2.5 million cars between 2015 and 2018, so between 600k and 800k per year, so that's about 6% as many as the new cars sold each year. So yes, that might change things by a percent or two either way.

B: Sorry, but that isn't how statistics (or averages) work. If you work out the numbers in that link, and weight the numbers for the bracket that includes 12 years, you get either 37% or 56% are under 12 years. So it's definitely possible for it to be 12 years. If you draw a curve based on these numbers you will notice a fairly sharp rise, then a long tail, with 12.3 being just past the peak. That gives a lot of cars between 12 and 20 years, leading to the averages we're seeing.