GOLDIATH is the online name of the mentioned businessman which has been robbed. He has a famous name and his real name was probably spotted by some well-organized criminal group. They can even be his close friends to whom he discovered his crypto wealth. All is relative right now and the police of the UK can only give positive interviews about their closing to the criminal hideout ( actually they will never catch the thief).
This is actually not the first physical robbery that includes the cryptocurrencies. Goverment gives us the information over the media that they can not suppress and hide. By my opinion there had already been many physical robberies of the cryptocurrencies in the criminal circles that cannot be revealed to the public (reveal can only lead to the prolongation of the investigation that the authorities are conduting). We are all victims of the false media publishment that the government uses for the manipulation.
I think this news was already shared here in previous threads. Now coming back to your reply, I agree to this. This is just like other criminal cases which are intentionally hidden in stats. Here in my country, the police is advised not to note all the complains as they have to report the total number of cases per month and year. All the states try to keep those stats to minimum, otherwise they are scolded by the politicians. If I was a rich investor and was robbed, I may not make this public as it can again happen in future if I get in limelight.