Every country has programs to improve its sport. Even though China failed to qualify for the 2026 World Cup, it doesn't mean they don't care about their football. It's just that Indonesia might have been luckier in the previous round, managing to beat China. As far as I know, at the Asian level, China's sport (in general, nit just football) was impoved, which means there are programs to improve football as well. However, Japan and Australia aren't weak teams that China can easily defeat, so that might be another reason why China failed to qualify.
China has traditionally been cultivating other sports, football is not in their interest and hasn't been for a while and I understand that, it has never been practiced to the fullest and that's why they can't build a strong team for the World Cup, their championship is rather mediocre and this means that they don't grow and don't produce players suitable for such a competition.