Plenty of papers analyzing developments in HK education curriculum pre/post handover from PRC/HK/western academics. Or demographic data on HK identity which diverge sharply by age cohorts pre/post as result of reforms. Or polling of HK sentiment of PRC stretching back since post handover. Or analysis from the mainland of why patriotic education was necessary to decolonize HK before culture fractures formed along generational lines. This is all 101 knowledge on the subject matter for anyone following HK/PRC dynamics since handover and before. Your knowledge level seems to match someone that self professed to have moved to HK in 2018 - negligible.