It's on-topic, don't worry.
The exploit 'being the cause' for the icon jump has been debunked
numerous times in this thread. It is well-established that it's due to the red-nail lady pressing the new ZR button.
You can try it if you have a N3DS(XL).
Of course, the exploit can nevertheless
still involve Mii Maker/Studio. There's no way to know until release. But if you're basing this solely on the icon jump in the video... we already know that it was the ZR button that caused it.
Please leave the horse alone already. What did it do to you?
As much as I don't want this to be the case, I'm sorta expecting it.