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Being Italian, maybe I can elucidate: if you roam an Italian forum you will realise how much obsession there is for components weight... down to the single gram sometimes... a 7.5 Kg bike is considered "a stone"... it is no surprise that in a similar scenario manufacturers lie a bit on the weight they claim. As a matter of fact most of the industry does that to an extent and if they do that with weight, you can be sure they do the same with aero claims, which are obviously more difficult to disprove. In essence, it is an industry that survives on false claims, a bit like health products, nutrition, skin products... in fact the list is endless
It's not a new thing that manufacturers lie about the weights of their products. The term 'claimed weight' only exists because of it. Otherwise they'd just be weights.