While this is pretty novel (I don't recall seeing anything exactly like this in the past 25 years), I doubt that it's truly more ergonomic than a standard keyboard on a desk that's at the right height and distance from you.

With the keyboards at angles like that your hands are going to be pulled by gravity downward away from the keyboard at rest. Meaning you have to hold your hands in typing position. Additionally, those keyboards don't seem to have a lot of support and I foresee a bit of wobble, which is also not great.

When I was young (early teens) and a novice programmer/avid gamer I used to have wrist pain. It turned out this was mainly due to two factors; bad positioning of my arms and wrists while typing, and typing too hard. I retrained myself to position my arms and wrists such that they are truly at rest when typing (weigh resting on the heels of my palms) and to type gently, only using the amount of force necessary, and never pushing against the key while it is bottomed out, and in the following 25+ years of typing often >12 hours a day I never have wrist problems, despite a variety of keyboards.

Usually when I encounter people who are having wrist pain from typing, their posture and typing too hard are the problem. Sometimes changing out the keyboard helps induce a more mindful approach to typing and helps them relax, or adjusts their position such that it fixes the problem. But often times it doesn't, because the problem is their behavior, not the device.

Try typing more gently, and try adjusting your posture so you're not having to use your fore arm muscles to hold your hands in position. Those may help you.

Obviously everybody should do whatever works for them, but this is my experience. And I've typed a lot.