Swimming is a real activity. No doubt about it. I love to swim too!
Why "deaf" swimming? So what if you can't hear the water splashing as you swim? Why does it have to be called deaf swimming?
Any time you have a hearing loss, you have a hearing loss. You were already deaf for years before you experienced total silence, in which you got your CI. What is your concern about what day you became "deaf" (December as you have said)? How does that specific day make things different for you, just curious?