as i found media files you want were packed in blocks with:

https://github.com/shaka-project/shaka-packager
which i found in request responce for first media file part defined by byte range in url parameters of request

and also if you sort requests in dev tools by name you will see that page tries to download parts of media files by different byte range

so i think if you read documentation in shaka-packager then you will found how to get all byte ranges for full file and how to convert blocks to one file or you can watch full video and copy all requests for its parts and found way to convert them to one file
(I dont know how, but I think this information which I found will help you)