I would assume so. Most likely it's an official disbandment since they're no longer listed in the artist line-up for KZ's website. XIS was under the KZ label, which was a part of RS. Kang's now with GMM, so most likely they would not want him to be working with their competitor (it's just my guess, so it's not a guarantee lol.) I think I also remember that XIS's contract required all members to be active as a whole, so since Kang is no longer with RS and if I rec...
*recall, another member also went to continue his studies abroad?.. XIS shouldn't be able to function as a group since everyone is needed for the group promotions and such.. since it was part of the contract. I forgot if their contract expired already too or not.. hmm. It's been awhile so it's not a guarantee if my information is accurate or not
I heard that they did disband awhile back when they "separated". Anyways, Kang probably doesn't care anyways now that he's a part of The Star and way more popular. lol