I'm guessing he might be referring to this.
A skyscraper is a tall, continuously habitable building of over 40 floors, mostly designed for office, commercial and residential uses. A skyscraper can also be called a high-rise, but the term skyscraper is often used for buildings higher than 150 m (492 ft). For buildings above a height of 300 m (984 ft), the term Supertall can be used, while skyscrapers reaching beyond 600 m (1,969 ft) are classified as Megatall
https://en.wikipedia.org/wiki/Skyscraper
A skyscraper is a very tall, continuously habitable building. Usually, a building is called a skyscraper if it clearly stands out above the surrounding built environment and significantly changes the city's overall skyline. The structure is expected to be at least 20 stories tall (although the term "skyscraper" was applied to early, 10-storied structures). Apart from that, there is no universally accepted minimum height for a skyscraper. In the United States today, a loose convention draws the lower limit for a skyscraper at 150 meters. Elsewhere, a building that is 80 meters (about 262 feet) tall may be considered a skyscraper, based on its relative impact on the city's skyline. In addition, habitability distinguishes skyscrapers from towers and masts.
The Emporis Standards Committee defines a high-rise building as "a multi-story structure with at least 12 floors or 35 meters (115 feet) in height."[1] Comparing this definition with the somewhat loose definition of skyscraper noted above, one can say that all skyscrapers are high-rises, but not all high-rises are skyscrapers. An extremely tall skyscraper, particularly one that is taller than 300 meters (1,000 ft), is sometimes colloquially referred to as a supertall.
Some structural engineers define a high-rise as any vertical construction for which wind is a more significant load factor than weight is. This criterion fits not only habitable high-rises but also other tall structures, such as towers.
I'm not sure I'd say there is a consensus.
http://www.newworldencyclopedia.org/entry/Skyscraper
So in Salt Lake City, I would say a 500'+ tower, depending on it's location, would have a significant impact to the skyline, thus defining it, in Salt Lake City's terms as a skyscraper. A building at 200' in downtown Provo would have a significant impact on the skyline vs the 130' Nuskin building and could thus be considered a skyscraper. On the flip side a 600' building in NYC wouldn't be considered one, because it would have a very minimal impact on the skyline.