It can be said that this table is somewhat correct.
In my opinion, one of the indicators used to draw this chart is the value of the national currency of the countries compared to the price of Bitcoin in dollars.
Obviously, countries with lower currency values will have a harder time buying more Bitcoin.
I think everyone should consider the inflation situation of their own country, the value of their national currency, and the policies of their government and save the necessary amount of Bitcoin, or even a little more.
Of course, I also have to say that I don't know what the indicator of this table was to determine the amount of Bitcoin a retiree needs?! Was it just to cover daily expenses or a life in complete and carefree prosperity?!
In any case, everyone should try to save Bitcoin with foresight and purpose.