They can be but they are only a small part of the overall setup. You still need to have proper posture and pay particular attention to your habits.
Different switches can also help depending on your typing habits and usecase.
For me personally having less keys means less movement leading to significantly reduced possibility of RSI. With just 42 keys on my keyboard literally everything is one key away from each finger on home row so I can spend more time typing and mousing around than a traditional full size keyboard+mouse setup.
There's a whole world of custom split keyboard options out there that use switches where it's super easy to buy replacement keycaps. You can get keycaps made of PBT which are long-lasting and have a very high "rub" factor so you shouldn't have to worry about rubbing them raw for a very long time.
It's an article written by a mainstream site so I wasn't really expecting them to talk about split keyboards at all but I agree wholeheartedly.
I went from a full size to a 40% keyboard to an ortholinear and now use a low-profile split keyboard as a daily driver.
IME it's so much better for ergonomics with a proper desk setup and seating/posture with the split halves shoulder width apart. Wireless is a great benefit as well if you swap between desktops and laptops.
Open source firmware like ZMK and QMK make it trivial to use splits with Linux, mac OS and Windows and for any environments where the OS is locked down and software installation is required.
Probably using a QMK firmware-based keyboard where you can access different layers and shortcuts.
I'm using one right now (though mine runs off ZMK which is similar but wireless) which is a split with just 42 keys. The rest--numbers, symbols, function keys, etc. are all under layers. The layout is dynamic because holding down different keys makes the layout 'change' as you do so. Holding down the left spacebar and pressing 'Z' sends 'F1' to the computer while holding down another key on the right half turns my WER/SDF/XCV keys into a Numpad, etc.
Different switches can also help depending on your typing habits and usecase.
For me personally having less keys means less movement leading to significantly reduced possibility of RSI. With just 42 keys on my keyboard literally everything is one key away from each finger on home row so I can spend more time typing and mousing around than a traditional full size keyboard+mouse setup.