"The interest is to be divided into five equal parts and distributed as follows: one part to the person who made the most important discovery or invention in the field of physics; one part to the person who made the most important chemical discovery or improvement; one part to the person who made the most important discovery within the domain of physiology or medicine; one part to the person who, in the field of literature, produced the most outstanding work in an idealistic direction; and one part to the person who has done the most or best to advance fellowship among nations, the abolition or reduction of standing armies, and the establishment and promotion of peace congresses."
You are stretching the definition of Nobel Prizes to only be considered in its original form. Other prizes were included over time and are considered Nobel Prizes by the institution that awards them.
You are creating a strawman to attack it. By any definition in 2022 the Economics prize is a Nobel Prize.
You not recognising it due to your strict definition doesn't really change the reality that it's called a Nobel Prize.
Alfred Nobel never intended to award a prize in economics (and neither one in Mathematics, though the background of _that_ might be more interesting).
From https://www.nobelprize.org/alfred-nobel/alfred-nobels-will/
"The interest is to be divided into five equal parts and distributed as follows: one part to the person who made the most important discovery or invention in the field of physics; one part to the person who made the most important chemical discovery or improvement; one part to the person who made the most important discovery within the domain of physiology or medicine; one part to the person who, in the field of literature, produced the most outstanding work in an idealistic direction; and one part to the person who has done the most or best to advance fellowship among nations, the abolition or reduction of standing armies, and the establishment and promotion of peace congresses."