Almost meaningless is extreme. Again, verticals are overvalued, but less so on vertically challenged (very short) guards. That is not saying it’s the only attribute needed.
We use height as a proxy for ability to get shots off and defend, hence a very short guard that has good reach/wingspan and vertical, isn’t actually that short.
The fact you say it’s a trade off between a quick release and height (vertical ) contradicts saying a vertical is nearly meaningless. A 5’9” point guard with an extreme vertical is much more likely to be successful, as it negates the lack of height. Even having a quicker release would require great range if the vertical poor and not utilized on the outside shot, plus the release does nothing to in regards to the ability finish.
I’m uncertain how shots of Haliburton or Bolton come into a discussion of why verticals are more important to tiny point guards. But Bolton’s vertical is a big reason as to why he’s just as effective at driving as the longer Haliburton. Same with LW, who also utilized his great vertical to create space on perimeter shots.
I think he's trying to say that most good finishing PG's don't rely much on explosion. A good NBA example would be Kyrie using his footwork and timing. Ayo Dosunmu would be a good college example. I think his vert is less than 25 which is baffling.
Conversely, someone like Lindell Wigginton can access 95% of his vertical on a jumper but doesnt have the footwork or ballhandling to use his explosion to finish. Wiggs would blow by someone and then get blocked because his 2 foot gather would cost him just enough time to be ineffective.