This looks like the release we're talking about:
The style guidelines say to use Various Artists for that. The artist on the digital release may be different—that's fine, all the releases in a release group do not have to share the same release artist.
When setting the track artists and ARs, you should of course use the track listings and other info inside the book.
(BTW: I couldn't find the digital release in MB—if it's there, the two release groups should probably be merged).