Blurting became popular through student communities online, but the mechanism it uses is thoroughly studied. Writing out everything you remember is free recall, the same activity Roediger and Karpicke used in their testing effect experiments, where recall practice beat rereading on delayed tests. The name is new; the technique is not.
The checking step matters as much as the blurting step. Comparing your page against the source turns vague familiarity into a concrete list of what you actually know and what you only recognized. Those gaps become targets for the next pass, which makes blurting a simple engine for feedback and prioritization, two things passive review never provides.
For reading workflows, blurting slots in after any substantial article or chapter: close it, write the argument from memory, then reopen your highlights as the answer key. It costs a few minutes and replaces the illusion of understanding that comes from a smooth reread with evidence of what stuck.