Inspiring, famous, influential, and powerful are not synonyms. The Ceaucescus exercised a lot of raw power.
The fact that he threw in Margaret Thatcher (who was not a dictator, and thus didn’t have as have much raw power) kinda shows that the author was just pulling opinions out of thin air, or exaggerating for effect, rather than carefullly measuring ‘raw power’.
Her power to dictate the life of civilians in her country was less than that of dictators; her ability to influence the world beyond her country's borders far greater.