Surely 23Kgs for hand luggage has to be a typo
It is not a typo. However, in reality, if the maximum size trolley bag that fits the gauge was full of wine bottles, it would only weight 14-15 kg maximum! If it was full of bits of engines, then that might be a different matter. Fortunately, we don't get too many people wanting to carry engine bits and bobs on board!
Mind you, I am still not too happy about having 14-15 kg bags over my head!