Kick point is the area of the shaft that bows the most during the downswing and through impact.
All shafts will bend somewhere near the middle of the shaft in an area about 100mm long. Some shafts will bend in this area more towards the butt, some in the middle and some towards the tip but within a fairly tight range.
Kick Point is a consumer terminology that is not really used in club fittings as it conveys little useful information.
Stiffness is a much better measure of a shafts performance. Stiffness near the tip of the shaft is what affects launch angle and ball flight the most. As the tip becomes stiffer the launch angle becomes lower.