I looked at their website, and what I found was that the 4 engine oils that met BMW LL04 5w30 met different specs from other auto manufacturers.
For example, some would meet VW 502, 505, and 505.1, some would meet VW 504 and 507. Another one met VW 503 and 506.
I guess the #1 focus was on VW engines, and any VW approved oil that was close to BMW LL04 would get a BMW certification.
It is my understanding that VW is the most common manufacturer in Europe, and because of that, it would be important for an oil manufacturer to have everything for every VW.