https://words.jamoe.org/highlight-question-and-answer/
A somewhat disingenuous reframing of the Cornell notes method. They've given it a different name potentially for marketing purposes to sell in a book. At least HQ&A is a reasonable mnemonic for what the process is.
They do highlight the value of modality shift from reading to thinking about how to formulate a question and answer as a means of learning. They don't seem to know the name or broader value of the technique however.
This question technique is also highlighted in the work of Andy Matuschak and Michael Nielsen. Cross reference: https://andymatuschak.org/prompts/ and their quantum mechanics course experiments.