Diego Betancur Álvarez is the son of a former Colombian president. He is the ambassador for Colombia to Australia and New Zealand. Being ambassador is a position that a diplomat may hold. It is similar to president to the United States which is a position for a politician.
It is quite normal that people do not understand such qualifications. It is however the essence of what Wikidata is about.
It is easy enough to make any and all humans who are known as ambassador a professional diplomat. It is easy enough to give them the position of ambassador as well. It just needs to be done.
Another approach would be to have one "ambassador to Australia" or any other country. The alternative is to rely on qualifiers.
PS Mr Betancur is very much alive.