Suede as a term has a wide range of different meanings, but the orthodox definition is a byproduct of full grain leather production.
A manufacturer makes full grain leather of whatever thickness by slicing off the upper part of the leather where the grain is. The vast majority of the strength in leather is in the grain. The remaining thickness is a loose collection of fibers with nowhere near the density, strength or water resistance of full grain leather. That’s suede. That stuff is far less durable than leather with the grain in it.
The suede referenced in the article isn’t suede by the traditional definition because it has the grain on the backside. The manufacturer description says it is, “A production of selected, young calf skins with a luxurious silky suede side and a natural full grain, aniline reverse.” It’s more of a rough-out leather, which is absolutely a durable and long lasting product.