thank you for this interesting report. In my work as an occupational safety engineer at a hospital I sometimes get reports about employees having an accident at work that was caused by stress and too much information, e.g. surgeons cutting themself into the finger or hand while working in the emergency operating room.
In addition to this study, I'd point out that the more "expert" you become at a given task, the larger chunks you can handle. A whole series of steps become so automatic that it's only 1 item in your brain, and on the opposite end of the spectrum, a total beginner has to break down the task into so few steps they're constantly referring back to the instructions/roadmap/expert for validation and to confirm what the next step is.
IMHO EMDR works, at least for me. I mentioned it in another forum, and someone said it worked for them too. CBT does have more research and people behind it.
I don't know (some say nobody knows) why EMDR works, all I know is I feel better when I do it. It's not rocket science, just try it and see if it works for you.
PS - everything has been "discredited" by someone. I recently read a story about someone from the Flat Earth Society looking at pictures of the Earth from Space. He said "It's amazing what a well rendered fake can do."