It is most likely the vaccine did not affect sperm parameters. The parameters happened to go up, but as the authors note, this was unlikely to have been caused

It is most likely the vaccine did not affect sperm parameters. The parameters happened to go up, but as the authors note, this was unlikely to have been caused by the vaccine. Several more plausible causes are noted in the study. The main thing the study does is basically rule out a catastrophic negative effect on sperm parameters from the vaccine.