I don't know how accurate Caltopo is over a short distance. Even a GPS will miss close together twists and turns.
According to
https://www.timberlinetrails.com/WhitneyTrailCrest.htmlIt is 2.2 miles from Trail Camp to Trail Crest, and then another 2.8 miles from Trail Crest to the Summit.
The only way to know for sure is roll a surveyor's wheel over the trail.