Staying on the 'history' preamble at the beginning of the video, a word about production quantities/sales figures.
We often see/hear the fact that the great majority of S30-series Z production went to the USA. That is correct, but it should not be used as evidence of absolute bias in design and engineering. Listening to how people use the numbers you'd think it did.
There was really not much in the way of design concession to the North American market variant because ALL of the variants seen at launch in October 1969 were conceived, styled, designed, engineered and made production-ready at the same time. Pretty much every one of those at-launch variants (S30-S, S30-D, PS30-D, PS30-SB, HLS30U(V), HLS30Q, HS30, HS30QU etc etc) carried details which were redundant, but present because they were necessary on other variants.
Sales figures are evidence of many factors such as market potential, selling price, exchange rate, taxes and duties, tariff quotas etc etc, but not so much of design and engineering.