i looked into this a little bit - you’ll notice on realoem the catalogue is only 2019. I think this is also around the time BMW made the TIS system update and also knocked off newtis. ETK is the name of the parts catalogue pricing data iirc. I have the db, uses transbase.
Good observation. I'd not really looked at it since we sold my wife's mini, which has been several years. The catalog was invaluable for all the work I had to do to keep it running.