You still didn't answer his question.
fer clearly says he lost 30% of his hearing on the right side
"He explained I won't be able to recover the hearing loss on the right side of my ear, and the surgery will help me not to completely lose it. Since I went to the US, I only play with 30% of hearing on the right side, and it affects me a lot in-game."
That condition is known as hearing loss and yes he is deaf unlike what you wrote earlier (He's not deaf, it's an infection.)
"Hearing loss, also known as hearing impairment, is a partial or total inability to hear. A deaf person has little to no hearing. Hearing loss may occur in one or both ears. In children hearing problems can affect the ability to learn spoken language and in adults it can cause work related difficulties. In some people, particularly older people, hearing loss can result in loneliness. Hearing loss can be temporary or permanent."