Latest questions about "contact deletion"

I have deleted someone from my contacts on my phone, but he still shows up in my Viber, both phone and my desktop. How can I delete the info I have about that person from my Viber?

I have just deleted a number from my iPhone (which means that I cannot see it in Viber anymore). I would like to know if that person can see me online on Viber or not from now on.