The image in the article shows the entire thing being 20cm and the actual ‘blade’ portion of the toy being around 13cm long. a little longer than the blade on a pretty standard multi tool like a Leatherman.
Is this seriously what the police were actually concerned about, I understand that it’s different in the UK vs the US, but this is definitely overkill. This thing would need to be pinched between your thumb and index finger like a cigarette to be wielded and is arguably less dangerous than a fork.