It's a good start, but a lot of countries are missing from the list.
It is true. This database has not the pretension to have all the stations in Europe. It has all the stations where we can sell tickets to. As we connect to more carriers, the database will expand. But it is a long process.
https://cs.wikipedia.org/wiki/Seznam_%C5%BEelezni%C4%8Dn%C3%...
This list seems to have a lot more stations than the website or Android app allows.
e.g. I can't book a ticket to/from London Charing Cross, or Cambridge, yet those are in the CSV file.