PM, JMD:
Wong Kiew Kit still teaches "Night Tiger emerges from forest", his Hung Kuen lineage is non-WFH from Malaysia, so this would support it being part of "old" hung kuen.
As for the short-bridges in GGFF being from Hak Fu Moon - I am doubtful. These represent some of the oldest elements in Hung - ie from whatever original art was transmitted from sil lum. I think it is more a case of Hak Fu Moon and Hung Ga sharing common southern sil lum ancestry, although as said many times Hung Ga, and especially WFH Hung Ga has diverged from its original roots.
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"What is the sound of one hand clawing???" -- chanh buddhist proverb