with unscrupulous breeders yes, they can be meaningless but with a good breeder and well bred cockers they are an
essential tool and very meaningful!
The photo of that dog is difficult to judge - the back is very sleek, the feet hairy but then a lot of working cockers do get very fluffy feet anyway. As for the ears well in that position/pose they do look very long and show like and that is more of an indication to me than the feet but again it could be partly the way the dog is sat. My working cocker has long ears but he is definitely from working strain.
There is a massive variation within the working cocker breed of size/coat/colour as well
I think your first step would be to find a good breeder and step away from this one