I'd agree with this, I don't really see them as being pop at all. Sure, 'pop' in the sense of being relatively popular, and leaning towards the more accessible/'radio friendly' end of the alternative/indie/post-punk/whatever scene, but not pop in the sense it's applied to music as a genre in its own right - taking the Pop music page on here, it doesn't really describe Franz Ferdinand all that well. There are aspects which could be applied to them but they clearly don't fit amongst the examples that page gives of pop artists/songs. As above, the source doesn't actually call them 'pop' anyway, but 'art pop', whatever that may be.