Because a giga-coaster is specifically defined as smaller than that one:
"Enthusiasts use the term to apply to a roller coaster with a drop of 300 to 399 feet, meaning that its riders fall the length of a football field. (Anything beyond 400 feet and you’re in strata coaster terrain.)"
"Enthusiasts use the term to apply to a roller coaster with a drop of 300 to 399 feet, meaning that its riders fall the length of a football field. (Anything beyond 400 feet and you’re in strata coaster terrain.)"
So yeah, weird article.