Lineage and curriculum both are legit.
Chiu Chi Ling is well-known and respected in the Hung Gar community, as well as being Si-Gong (one of them anyways) to our local admin Gene Ching, Onassis Parungao from kwoon.tv, and a slew of other highly regarded Hung Kuen teachers out in europe, HK, and everywhere.
The other (non-pillar) sets like Arrow-hand are basic introductory sets that while not officially part of Hung Kuen have pretty much always been taught in Lam family Hung Ga (Wing Lam learned from both The Chiu's and the Lam's). Their includion doesn't make it "augmented Hung Ga", pretty much every other Hung Gar teacher changes the non-pillar sets and includes a couple different ones to taste. Lau Ga kuen (Lau familiy fist set) is an exception as pretty much all lineages of Hung Ga teach it, even though it's not considered a "pillar form".
Considering Hung Kuen from Chiu lineages, and Wing Chun from Augustine Fong I'd say this is a very good choice. You'd be hard pressed to find a better training opportunity, anywhere...
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"What is the sound of one hand clawing???" -- chanh buddhist proverb