Sarada being a Prodigy is a joke.
Most of these shinobi, including Chou Chou, are already on higher performances than their parents. For instance Chou Chou is using the expansion jutsu, despite Choji only being able to perform the same in Part 1 with special pills.
Sarada using CES is impressive, but it was never stated to be impossible. Sarada is just lucky enough to be born with a parent who can teach her, study, and learn from. If Sakura was given the same opportunity, she would of been just as powerful.
Boruto is being hailed as Prodigy, is mainly because he did something that Kakashi/Minato couldn't do, hell even though Naruto DID it, he only did it at 16, with hordes of clones that Boruto cannot produce.
Or
Because Boruto invented a new technique.
We can't be sure yet until the movie comes out though.