I believe you are just saying it differently. However, you are not teaching height when teaching or reinforcing positioning at take-off. You are teaching postural awareness, as height is a symptom of take-off angle and speed just as length is symptom of take-off angle and speed.
How many since you have been in high school have you heard a coach say to an athlete at a meet these things after telling them they had a less than optimal jump.
“Drive that knee through”
“Get some pop off the board”
“you have to get more height”
I can almost guarantee you 9 times out 10 the next jump will be just as bad if not worse after this type of feedback is given to the athlete as they are likely to scratch or create a really high take-off angle compared to their last jump while sacrificing speed.
While correct positioning is more about acceleration, speed maintenance, stride patterning, and leg stiffness. You cannot get correct positioning on a consistent basis without these.