That's linear feet of the layout, not the actual track lengthApparently it’s just a little shorter in tracklength than VelociCoaster,.
This person is predicting it might be the best roller coaster on the West coast, maybe even better than VelociCoaster.
Video provides a thorough break down of the leaked layout plans.
That person is the click bait of the coaster realm. Makes these outlandish "predictions" like telling his followers that Starfall racers is one long track lol. In other words, that person is a joke.
4 Launches? I could see see 2 ( the initial launch and a launch at the bottom of the hillside) since it should pick up speed as it traverses the hillside but will a layout length shorter than VC, I think 4 launches will be overkill.