Is that actually true? I’m very curious if there’s any theoretical evidence that a society where everyone is at minimum “middle class” can exist.
Extraordinary claims require extraordinary evidence.
A tech like AC is not available to everyone all at once. It starts out very expensive and gets cheaper over time. It may end up cheap enough that it can be ubiquitous, but before that point there must be a time that only most people can afford it.
If you then include it in the must-have category before the point of ubiquitousness, you will never get rid of poverty. Whereas if you include it after the point it's a pointless exercise, because everyone that wants one already has it.
The fact that we're not providing the above basics universally to all citizens right now, as a matter of priority above all else, is a damning critique of government and one of the main reasons that set me down the path of anarcho-capitalist thought.
Consider a couple of other stats from that site:
> the proportion of population with access to electricity in 2020 was 100%.
and a 2.5% unemployment rate.
For concreteness, I'll say that I would define "poor" as not having the capability to satisfy the lower tiers of Maslow's hierarchy. ( https://en.wikipedia.org/wiki/Maslow%27s_hierarchy_of_needs ) By that standard Bhutan isn't poor despite being technically a Third World nation.