أَنَّ الْمُرَادَ الْجِنْسُ
The intended reference is to the kind or genus.
“Knowledge of realities is possible” affirms that genuine knowledge occurs, not that every knower knows all aspects of every fact. A kind can be affirmed without distributing an assertion over each member.
“Human beings can acquire knowledge” does not mean that every human knows every language, science, or event.
This logical distinction avoids turning a defensible claim about the existence of knowledge into an impossible claim of universal human omniscience.