Maybe the "paper" in the "mache" is not as finely ground and instead made of more granular wood chips, but its definitely made of a thin lamination of wood grounds held together by some adhesive.
Its light as a feather though, so that's pretty nice.
It's certainly not designed to bear my weight on 4 small spots, however, so I wouldn't even try that. It's not made of solid wood, but the furniture-equivalent of an F-22 wing.
All of my previous ikea desks are also spending their sunset years toiling away in the shop. The oldest one is 20 years old and I use it for assembling heaving parts because nothing sticks to whatever plastic coating they use on their desktops.
Also, the obligatory note that Ikea does sell solid wood furniture. It's made of softwoods, like pine or fir, but if you put it together with wood glue, it will absolutely outlive you. I have a dresser that's survived six moves where I never bothered to unload it.
It might even be this exact one: https://www.youtube.com/watch?v=9vNRY6natiY