I personally read that passage faster than normal (2x-ish), but yeah, zero comprehension afterwards. If my brain is just filling in the blanks for the back half of every word I'm not actually "reading", I'm solving a puzzle and then on to something else.
It helps me read faster, but IDK what effect it has on comprehension in a longer text. If I struggled to read I might be tempted to try it, but thankfully that's not one of my many issues.
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