i'm aware of why people think it looks like a sao choy, WR, i see the resemblance in the form, but when i strike with sao choy i step forward with the opposite foot from the hand striking, ending up in a bow stance, and it looks a lot like a boxing overhand right in sparring. the chop choy variation i am talking about steps with the same side foot as the striking hand, and lands in a side facing horse stance, and looks exactly like what cung le did in that gif (striking with the lead hand.)
that way is not a hung ga(r) application of chop choy, but a CLF version, which our sigung adopted into our lineage. the one i'm talking about isn't in the form anywhere that i have seen.
none of this is important, and i doubt any of you but WR really care.