Looks very like a photo I took of "Anais Segalas in Australia (and NZ)" scrambling through ferals in shade, in South Australia.
Re understocks: this rose was used as an understock here - no idea why people would use a suckerer, but after all there were early (disastrous) experiments of using rugosas as understocks for standards (tree roses). At least "Fantin-Latour" doesn't sucker, which to me supports the suggestion that it might have been used as an understock. But not in Australia as far as I know.
I don't know De la Grifferaie well enough to comment.