I think the challenge here might be that, as the article says, this is all just hypothetical and hasn't been empirically tested. It also sounds like a lot of the reasoning predates modern babywearing equipment quite a bit.
With our kids, we used two different devices. One was just a long strip of cloth that you tie in a special way. The other was a more structured carrier with straps and buckles and all that good stuff. For both of them, the child faces toward the parent, so they would be rear-facing relative to the plane. And both have an option to fully support the head. The main purpose there is just to protect their neck while sleeping or during moderate activity, but it would offer at least some additional protection against neck injuries in a crash, rough landing, or during periods of turbulence.
Perhaps crush injuries are more likely with the baby strapped to you, but honestly I would be more worried about a parent holding their baby being more likely to drop them in the aisle during an evacuation, which would be more likely to endanger everyone behind them on the plane as well.
I think this is very true. the general consensus from NCPS techs we've talked to is that the most likely fatal injury to a child is spinal - their heads are extremely heavy relative to the rest of their body in infancy so the 'safest' seats tend to be the ones that distribute kinetics away or absorb it (like rear-facing seats where the sudden 'stop' pushes into the seat rather than having the baby's head fly forward)
that said, I've also heard that the US standards for car seats is piss poor relative to the rest of the world's. something about how they only test one head-on crash at 35mph and then extrapolate all the data from there. Germany's ADAC is supposedly the gold standard and I can see why - their tests are intensely comprehensive and granular, in the way you'd actually want them to be, and many of the seats rated safe by American standards fail ADAC: https://www.besafe.com/en/safety-tips/tests-awards/adac/
if there were to be a plane-oriented solution, the last place I'd trust it to be taken forward is in the USA especially given how easily corruptible safety-oriented institutions are here