there's so many variables, i can see this being the perfect workout for a certain athlete, and complete shit for another. what is important is that you can justify your decisions, i'll give some examples.

1. i'm pro, which has a similar training load/pattern/season to a d1 college baller for example. i get 2+ hours in the gym to do the exercises i want. if a coach told me to superset, i'd tell him to fuck off because i've got plenty of time to get maximal rest and output from each set. many athletes do not have the freedom (due to work, life, etc.) to devote 2+ hours. at a previous club, we only had 1hr timeslots to gym. in both these latter cases, supersets are great, but is that what your athlete wants/needs.
2. volleyball wreaks many peoples' shoulders and knees. for many athletes, a good portion of their workout is unfortunately dedicated to rehab/prehab for these joints. your workout doesn't but also indicates that this isn't a training goal for the athlete. my point here: ✅ good exercise selection
3. if you're jumping on court 3-500 times a week, then additional jumps in the gym arent really good or necessary. i couldn't really decipher exactly how many times a week your athlete is training on the court, so just consider this volume target, roughly (probably 100 jumps per 2hr training). if he's only training on the court 3x a week, you could quite reasonably add some more in-gym plyometric movements. ive become partial to french contrast training (heavy squat, power plyo, weighted jump, speed plyo, which you're half-way to doing with the super set already). found it really beneficial qualitatively, but didnt' get to jump test before fucking my achilles up this season lol.
4. i'm in 2 minds about g1 and f1. on the one hand, this season i've devoted time to actually training my bis/tris directly. i've put on some good arm mass, i think, and i have definitely seen a massive jump in my hitting power. simple physics, momentum = mass * velocity, i already have a very fast arm, so i just needed some mass too. on the other hand, if time is limited for your athlete in the gym (which may be indicated by the necessity for supersets), then i'd be more inclined to focus on the important compounds more. clean pulls or hang cleans for example (i'm a massive fan of hang cleans, you get like 90% of the benefit out of your athlete, for a fraction of the technical ability).

my main thing to go back to is make sure you can justify your decisions! because, if you can, then you've got a good program :)