Everything below "production process will include following steps" makes it clear that original artist is not involved. See also this text - "The money collected from this campaign will go for production of one motion comic video, based on the «The Potion Contest» episode".
It's a mandatory requirement of license to "give appropriate credit" - https://creativecommons.org/licenses/by/4.0/deed
If author of the campaign wouldn't put David's name on the artwork, then that would be violation of license condition. Let me know if you can specify any other way to "give appropriate credit", without mentioning the name of original author. ^__^