So it seems the user "latiasfan2004" on GameFAQS has been updating NBA 2k2 right up to March 2024!! Maybe get in touch with them and ask how they're updating rosters?
edit: I sent them a PM. Let's see if they reply.
https://gamefaqs.gamespot.com/dreamcast ... -2k2/saves
aka DavidHK on DC games.