Not sure where you are taking that from. Wikipedia has

Later, in an Ars Technica interview, Sid Meier similarly stated that the bug was possible, "but it was not intentional".

On September 8, 2020, Sid Meier's autobiography, Sid Meier's Memoir!: A Life in Computer Games, was released, containing confirmation that the Gandhi software bug was fabricated and a detailed background of the urban legend's formation.

So this sounds like the statement you refer to was not "ultimate" but still part of creating the hoax.

Edit:
Quoting the translation of one of the sources here:

The myth was also refuted by Brian Reynolds, the leading game designer of Civilization II - in a video for People's Games, his quote is mentioned, that the game has only three possible levels of aggression, and not 10 or 255. At the same time, at the first level there was not only Gandhi, but also other leaders, which in this case should lead to similar bugs with many other factions.
[...]
It all started with Sid Meier's Civilization V. In it, India really had the preference for nuclear weapons to other forms of warfare at a point close to the maximum - at level 12. John Shafer, the leading game designer of the fifth “Civilization”, made this parameter so high solely for the sake of a joke.

Article goes into it a bit more, but summary it all started with Civ5 in 2010, where it was an intentional (joke) decision not a bug.
All nuclear ghandi stuff dates to civ5, it did not exist before that time. Then in 2014 someone on reddit made up the hoax and publications just ran with it.