Not to be Debby Downer but these aren’t 7.5s and 8s at a recognized show. These are schooling show scores and, in my experience, you rarely see any tests beyond 2nd level at 90% of the schooling shows and when you do, they tend to score well as long as they aren’t dumpster fires. There is the unfortunate habit of schooling shows scoring high.
So maybe these are 7.5/8 changes but at a recognized show, that’s a change with jump, balance, straightness, no lateness anywhere, and looks darn near effortless. On a horse who doesn’t have the strength yet carry through the lateral trot work, that’s pretty darn unlikely.