What is a "One-stitch Lift"?

The conclusion most patients reach at one year after having one stitch lifts or threadlifts is that the results are disappointing. They did not receive a facelift result with a single stitch as they had hoped.
When tissues are pulled with a hook with no undermining, the usual threadlift or one stitch technique, they cut through the tissue like butter. Fortunately, the marionette appearance from the subcutaneous tissues being pulled in a few specific areas softens as the sutures cut through and relax.
When tissues are undermined, and sutures are placed, this allows the tissues to "stick" in their new uplifted position; the sutures then become redundant (and self-dissolve) once complete healing occurs. This type of lift gives more permanent results. It is not the pull that gives the permanent result; it is the healing of the tissues in the uplifted position that does.
Of the many many revisions of previous threadlifts we have performed, we have universally noted that the threads were loose and did not hold tension on anything.
The good news is that aside from a few sutures popping through the skin, or palpable knots below the surface that required removal, most of these lifts don't seem to have done much harm. We simply perform our revision work and remove the sutures. Patients are usually amused to see how their threadlifts unwound.
While most of my patients are well off enough to write off their "investment" in a threadlift to experience and have a good laugh over it, I feel bad for the patients to whom the fee for the threadlift represents a significant investment.
While most patients now are quite familiar with the above information, as echoed by the other experts, there is a whole new batch of one-hour rejuvenation wonders that are claiming the funds of the trusting and uninformed.

Honestly, I had to smile when I read your question. There is no facelift procedure that should rely on only one stitch. It sounds to me like a marketing pitch - not a solid facelift procedure that I would recommend. Excellence in facelift surgery does not come with speed. Rather, it relies on thorough understanding of the patient's aging pattern, facial anatomy and experience. Skillful facelift surgeon pride themselves on durable and beautiful results, not how few stitches they use or how fast they can do things. 

There have been many developments like the "one stitch" threadlift throughout the years. These procedures almost always result in disappointing outcomes for the patient and surgeon alike. There is no substitute for a true facelift procedure that tightens both the muscle layers under the skin AND the skin itself. More techniques like this will probably be attempted in the future, but until then, I will continue to offer my patients procedures that I know work and are long-lasting when they are looking for cheek and neck rejuvenation. Be sure to see an expert.
All the best,