Just want to quote this to reiterate what Rod said. Don't confuse the two terms. They are not the same thing.
Guys I've played with a Slip Stroke all my life. Only until recent years, being a senior and not playing near enough I changed to a more conventional pendulum stroke. No matter but please do not confuse the "modern" as it was called Stroke Slip with a Slip Stroke.
Its just that, a Stroke Slip (letting the cue slide forward on the follow through), not a Slip Stroke (where the hand slides back on the butt end of the cue). Slip Stroke rs start forward on the cue and slide their hand back. The player determines how much. They increase bridge tension a little to hold the cue in place. They usually have a slight pause when their back hand reaches the desired position. They usually have a very light grip. They are in no hurry to rush the cue forward. That means no tension on the forward stroke. Which takes them through delivery and let the cue weight release. They may have a slight Stroke Slip as well at the end.
The Stroke Slippers only, do not have a Slip Stroke. If you care anything about pool history and want to learn something, please don't confuse these 2 terms.
I suggest its not a stroke you would want to learn or teach. Like anything it takes time and practice but we do that anyway no matter what stroke is used. For most just making precise contact with the C/B is enough of a test without the variables. However if you struggle with superior grip pressure LOL and don't get through the cue ball because of such -- you might want to take a walk on the wild side and experiment a little.
A long list of Champions have used this stroke with great success. The most notable being Jimmy "Cowboy" Moore . So once again at least give our Champions respect and know the difference between these two types of strokes.
Rod