When I look at the full picture of the knife in the EDC thread it seems to me that the spine actually starts out going upwards for a few mm up to the swedge and then changes direction and goes downward.
It also seems too short and stubby,... I have not seen a lambsfoot with those proportions yet or one with a long swedge covering most of the blade.
I doubt the designer was inspired by the lambsfoot to be honest as it seem to me a variation of the tanto/reverse tanto offerings on moderns knives which trace their origin from a different region of the world.
To me, in my limited knowledge, the lambsfoot is all about the well executed proportions and beauty of the whole blade as the picture on post #2 describes.
Edit: As I keep trying to fully understand the original question
:
I don't think that knife is trying to reinvent something that already exists