This is the same question as "How would the information even get put into something like Wikipedia in the first place" - knowledgeable people in the field do th

This is the same question as "How would the information even get put into something like Wikipedia in the first place" - knowledgeable people in the field do the work of aggregating academic information and turn it into a database of sorts. This seems to be accomplished in this case by running it as a business with a founder who has a degree in geography and history + a team of variously skilled people (history + tech + business).