There has been no official information about why both the rhythmic and the VDC closing scene were removed from Book 5 on EN.
The “Neige’s voice actor” rumor is a little unfortunate as it puts the blame on a person who is possibly entirely uninvolved, and might not even know what happened.
As of this writing all rumors are just speculation, and as far as we know it is no more the fault of Neige’s VA, his agency or fan behavior than it is anyone’s fault.
EN players were provided with the in-game rewards that they would have received for playing the rhythmic. It is just the game itself and the final closing scene that they were unfortunately not able to experience.
A related rumor is that the song is a literal, word-for-word cover of Snow White’s original “Heigh Ho,” possibly resulting in these unconfirmed copyright issues, but it is not. And it also isn’t the Japanese-language dub of the song.
Even so, the song is still a remix, so while copyright concerns with Disney USA are not based in anything but rumor, it is not impossible.
Another rumor says that the song was removed because of the strong backlash on JP, with some people even saying that Rook’s VA or the developers were threatened, but there is no proof that this is the case.
For reference, here is a collection tweets from the day that Rook’s betrayal was revealed in 2021. While there is some negativity about how quickly Rook was forgiven, there are also comments saying they are glad that Rook’s role as the hunter included his betrayal of his queen, and how the reveal made them laugh.
Inquiries on JP-user platforms results in the unanimous reaction of no one hearing of any backlash, and there are no tweets or official statements from the VA, his agency or Twst’s development team.
It was a passionate time for the community, but there are no verifiable reports of harassment or threats and it is always good to be cautious about spreading unverified rumors.
Japan has strict cyber-bullying and harassment laws and threats are very likely to result in a response, such when two people wrote threatening comments on a website in 2019 towards seiyuu Ito Ayumi, leading to their arrest.
It is not unusual for rumors of “purported threats” to cycle around without any actual threats being made, as people assume that someone, somewhere is probably angry enough to do so. But “someone told me” and “probably” are very different from “actually happened.”
While a common rumor in the EN community no screenshots of proof have ever surfaced. It was possibly one of those miscommunications that tend to happen when a fandom crosses languages.
Twisted Wonderland Reference Note 