" Natural Rate of Inflation"!

Mirkazemi the Iranian trade minister has made a new discovery! A few decades ago, some economists invented the term " natural rate of unemployment" but what Mirkazemi seems to have discovered is a " natural rate of inflation" for Iran. He says in this piece the a rate of inflation of up to 49% is " natural"! I have read this piece, but do not understand what is "natural " about a rate that doubles prices in every 20 months!