It's funny because I think of the stereotypical Australian as ESTP or ESFP.
Australian culture might feature more activities and norms that happen to be more common among ESXPs in cultures in which those are rarer, without the people themselves being more often ESXP. Cultural differences probably develop for reasons other than type demographics.
Surfing for example. In Northern Europe, the overwhelming majority of people who've ever tried surfing will be SPs, because it will be something they'll have had to have made much more of an effort to make happen, and have liked the idea of so much that they tolerated the unfavourable conditions. Along the Australian coast, it's going to be such a common pastime to have tried that the SP correlation will be weakened, but outsiders may still perceive it as SP behaviour.
The same may be true for standards of dress (Australians more often wear shorts and go outside bare-footed) and communication styles (more direct and blunt). In other cultures these behaviours would be attributed to certain personality traits but they may be more common in Australia for unrelated reasons.
People in Yemen probably perceive Western European and North American cultures as ESXP cultures because people here commonly behave in ways (pre-marital sex, drinking etc.) which in their country would be more often undertaken by the most sensation-seeking and risk-taking people.
Relatively speaking, our
cultures probably are more ESXP for that reason, but that doesn't mean the individuals within them are more often ESXP than the individuals in Yemen.