Just from a quick glance at the page, it seems similar to a therapy technique referred to as “easy onset.” Normal speech uses very low air pressure; stuttering is often accompanied by very high pressure, as if we’re trying to force the words out of the articulators to move. Easy onset tries to solve that issue by beginning speech with an airflow, instead of moving the articulators first and then forcing air through them. It’s quite effective, I find. Not perfectly, but if what is being described is what it seems, then it’s at least clinically valid.