Beat me to it, this excerpt from the paper's own discussion section explains why the paper itself is bullshit.

While these results showed statistically significant increases in all sperm parameters, the magnitude of change is within normal individual variation and may be influenced by regression to the mean. Additionally, the increase may be due to the increased abstinence time before the second sample. Men with oligospermia did not experience further decline. The limitations of the study include the small number of men enrolled; limited generalizability beyond young, healthy men; short follow-up; and lack of a control group. In addition, while semen analysis is the foundation of male fertility evaluation, it is an imperfect predictor of fertility potential. Despite this, the study’s time frame encompasses the full life cycle of sperm.