Hmm it's quite hard to confirm if you the person herself doesn't confirm it. We can always send her a tweet, but we don't know if she'll respond. The person who owns the account may be 96neko herself or she may not, but i believe it's a fan impersonating 96neko.
I've done a little research based on the link you've provided. If you go down to the journal history, you'll see an interesting topic. "Curious about how vipTenchou looks?" If you click the link it shows a picture. However if you take a look at the link it was uploaded by the user "Manga-kaMaster" Which doesn't seem like a "legit" kuroneko username. I'm not saying it's impossible though, because it's not.
Take a look at his/her account: http://s1284.photobucket.com/user/Manga-kaMaster/library/?sort=3&page=1 If you flip to the second page, it seems he/her has quite an abundance of legit selfies or photos taken of 96neko.
What i find strange however is about vipTenchou. There is no information (or that i know of), about 96neko and vipTenchou having connections in real life nor do we know how vipTenchou looks like in real life. According to the spanish wikia, http://es.utaite.wikia.com/wiki/Vip:_Tenchou he looks like so. I believe i've come across this photo before in this wiki, however it was not put under the name vipTenchou. Here are some photos i believe are valid: http://25.media.tumblr.com/365d4cd38c64ea575081b36a991503a1/tumblr_mor6d0Od6i1rmkef5o2_400.jpg http://24.media.tumblr.com/1efd062e97b361897534edc78f498c82/tumblr_mor6d0Od6i1rmkef5o3_500.jpg http://24.media.tumblr.com/57ed0d2db01f652709aeafe451891258/tumblr_mor6d0Od6i1rmkef5o4_400.jpg
Not so sure about this one but here goes: http://25.media.tumblr.com/d7c12176eaf4b4da7579c49748d35227/tumblr_mor6d0Od6i1rmkef5o5_1280.jpg
Another thing i can say is the "friends" list sort of gives it away. Take a look at it yourself.
Some things to note about: Deviantart isn't a popular japanese site; under about it says she's an official beta tester; although this is only purely hypothetical this account was created 3 months ago and has no premium membership, the majority of impersonators do not pay for their accounts; I've been following her twitter account for a while now and she always starts her tweets with "【定期】", "【96猫オフィシャルファンブック】" or "【96猫情報bot】".
^ Seems like she's/he's purposely trying to degrade his/her english, right?
Well that's about it from me... it's alot easier to just ask the person herself. Sorry for posting such a long reply... （・□・；）
I have friended 96nekotapioka on DeviantART and I have been told by 96nekotapioka that she is a very close friend of 96neko and that she tells 96 what people say. I know that the Divaiant user speaks Japanese because she answeres me in legit Japanese, not Google Translate Japanese. I know that I'm replying 2 months to late but... whatever.
Well, there was a Tweet from 96__neko stating that was her deviantart. She answered in her best english, making it clear. The tweet was screenshotted and all over the internet. I first saw it on a 96Neko tumblr then her Twitter. I can't find tge tweet, as it is buried, but here's that wonderful screenshot. http://s8.postimg.org/vu2cbp3xx/1424482_353394571471938
I have also done good research, that's her Deviantart. :3 Have fun!
She mistook Kogeinu for VipTenchou, and of course the three of them are friends in real life, as twitter states, since they sometimes post something about them hanging out together. I'm certain it is not the real Kuro.
96neko talked to the some of the same people on Twitter that are on her deviantart, and 96Neko and both the users were all talking about there deviant, she said it is the official deviantart and ran with permission, the person on the deviant works with 96neko on the deviant, just like her Facebook page and 96Neko Twitter Bot. However, 96neko also uses/browses around with the deviantart occasionally.
What do you think?