Earlier quoted context omitted.
So they only want high earning workers from developed countries, basically the kind of immigrants every other country wants but doesn't dare say it out loud. What's wrong with that? Their country, their rules.
Japan seems conservative compared to New Zealand, which limits immigration for those with a range of disabilities - including autism spectrum disorder: https://www.immigration.govt.nz/new-zealand-visas/preparing-...
Unless you qualify for asylum, then all bets are off and these rules are waived.