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.)"
A giga coaster is between 300-399 feet, while a strata coaster is 400+. I guess they didn't include the two strata coasters (Top Thrill Dragster being the second) because they don't go through as long of a ride.
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This article is confusing - what defines a gigacoaster? Why isn't the Kingda Ka (tallest North American roller coaster), for example, among them?
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.)"
So yeah, weird article.
A giga coaster is between 300-399 feet, while a strata coaster is 400+. I guess they didn't include the two strata coasters (Top Thrill Dragster being the second) because they don't go through as long of a ride.
https://en.wikipedia.org/wiki/Roller_coaster#By_height