The file you’ve referenced is a good source of information for station facilities, but the lines served information is not kept up to date - we would consider this one of our “legacy” feeds.
You should find that the Unified API has upto date information on Stations with their lines served, feeds, live arrivals etc. See https://blog.tfl.gov.uk/2015/10/08/unified-api-part-2-lot-location-of-things/#more-1359 for a few examples.
The benefit to the Unified API is that it aggregates facilities information from multiple sources, including the one you have referenced. In future, we are looking to improve facilities information further (e.g. the accessibility of every bus stop in London) this will also be surfaced automatically in the Unified API.