Well, no media lasts forever, but we still have to store digital content somewhere for archival purposes. (ideally more than one copy, naturally, routinely checked for data integrity).

But yeah, the long-term reliability of media is often a key consideration in archival storage, which is why I think it's suspicious that they brand this media as 'archival' without providing any information at all about what they think it's long-term reliability is, compared to other (optical or other) media.