I forget what the GBAMP had as far as extra hardware for this sort of thing but it was different.
That listing looks like it lied to you, or at least stretched the truth somewhat. With meteo you can indeed watch a video but it is not something I really suggest for day to day use where something like moonshell on the DS I quite happily used for years. Speaking of the DS the EZ4 no longer has DS abilities so that pass card stuff is irrelevant, it will happily act as a GBA cart though.