(See this article)
It may be that the genes responsible for the fungal resistance can be classically bred, or genetically engineered, to make other vinifera grapes fungal-resistant. Until that happens, I will continue growing Modern varieties (vinifera-American grape hybrids) for disease resistance.
Life, and knowledge, keep changing. Thanks to the poster "Anonymous" who informed me about this grape on Oct 28 through a comment to my earlier post.
