Yes, but I'm surprised nobody has pointed out the bigger implication of the this observation--the observation that champions frequently are drawn from kids growing up around poolrooms. It means ours is a very underdeveloped activity and that no current pool player would likely even be pro level if pool had a couple decades with the popularity of, say, soccer
What immersion does is put an INDIVIDUAL at the high end of the INDIVIDUAL's potential. Whether that individual's personally high performance is good in the bigger world depends the pool of people who are reaching their potential.
Consider this. If everyone who responded to this thread was immersed in basketball from a very young age, we would all be way better that we are now. But likely none of us would be basketball champions. That is because, at least in the US, pretty much any kid who runs and jumps well and has decent coordination is reinforced from a young age with a basketball.
By contrast, you could adopt any kindergarten class, work with the kids immersion style for a decade, and produce some world-class pool players.