It was an argument made in response to your strawman argument that only Commonwealth countries would win Olympic medals in the next 100 years, and ignoring the possibility of further expansion, beyond the 30 or so NOCs where cricket is a significant sport, as a result of becoming an Olympic sport.
I referred to handball because it bears similarities in being a very Eurocentric sport which did not have the benefit of universality when it came into the Olympics and only significantly spread beyond Europe after becoming an Olympic sport. Even now it remains weak in most other parts of the world and apart from South Korea, China with a bronze is the only non-European country to win an Olympic medal in 86 years of trying.
Incidentally you've referred to rugby as being a Commonwealth sport which is not true in the sense you mean it. It has historically had strongholds in places way beyond the Commonwealth such as France, Italy, Romania, Argentina and Japan.