What idiot wrote that! There are a defined number of possibilities, which get whittled down significantly with the marque games, venues, sold games, etc.
Apologies but I have to defend the nerds amongst us (you know who you are). I have extensive fixturing experience, the perfect score scenarios I post are actually a bi-product of the knowledge I gained doing this. Even with those constraints you mention the number of combinations is massive and trying to find the one the best suits the requirements is a highly complex task.
The impression I get from the video is that they create all the the different combinations and then analyse them against the requirements. I have tried that sort of approach and it is generally impracticable because it would take years to even generate all the combinations using the normal sort of computer power I have access to. They must have some type of next gen super computer if they are doing that. They don’t mention it directly but I suspect they are actually using linear programming to develop the optimum solutions which could be described as “analysing all combinations”.
I found it interesting and would actually be very interested in learning more.