Digital data tapes have a nice layer of error correction on top.
Better than film, but still requires some care.
In contrast, I can read anything from the Barbarastollen with a magnifying glass and sunlight, today and in 500 years.
I bet in the very long term it's not. I suspect that error correction on digital tape is only meant to address the problem of magnetic spots flipping or fading over time, but the tapes are throwaways as soon as there's detectable physical degradation or disintegration. Contrast with analog tape (or to speak to your point, film) which can be handled in all kinds of crazy ways (cleaning, baking, coating, etc.) in order to get at least a partial or imperfect copy of the original made.
The cellulise acetate used for 16mm films up through the 80s has to be kept in humidity and temperature controlled environments or it breaks down quickly into acetic acid which accelerates the process further.
Cellulose acetate film was introduced to replace highly unstable nitrate stock in the 30s. With in a decade of its introduction, archives were reporting significant degradation and it was realized that it needed to be stored in climate controlled conditions. It wasn't until the 80s however that serious efforts were put into preservation or development of better archival mediums.
Of course this was touched on in the article. Wikipedia had more information.
Magnetic tape is hard to keep. Film is even harder, it is flammable and decays as well. Needs controlled atmosphere to keep well.