No, no, I meant their LMP program. They entered LM in 1998, but failed. They came back in '99 with a new car, won Sebring and Le Mans. They contested the ALMS in 2000, but didn't go back to Le Mans, did almost no development work on the LMP and finally withdrew at the end of the season. That's what I was referring to.
As for the M3 GTR, I fault the ACO on that. The ACO threw out their own rule requiring a series of production models, and BMW took advantage of that (it had already been exploited by Porsche) and built a winning car, with no intention of building road cars. Because BMW shrugged off a Le Mans attempt, the ACO came down hard on them and banned the car.
Honestly, I don't know what is so 🤬 hard to understand about GT racing.

It's supposed to be about racing cars based on their road-going sisters. However, the ACO and FIA manage to screw it up so much. They allow one-off cars that have no place on a GT grid, mess with the rules to favor one car over another and generally make it needlessly confusing.
If it were up to me, I'd go back to the original intent of the Le Mans organizers. Mandate GT racing cars to be production cars with few modifications (mainly safety) and base the classes on the volume and price of the road cars, so that cars competing in the same market would compete against each other on the track.
GT1: low-volume, high price supercars (Ferrari Enzo, Saleen S7, Pagani Zonda, etc.)
GT2: higher-volume, lower priced sports cars (Chevrolet Corvette, Dodge Viper, Porsche 911, Ferrari 430, etc.) and perhaps a
GT3 for small, cheap sports cars (Mazda Miata, Honda S2000, etc.)
A
Prototype class would be included, to test new ideas for "green" cars (hydrogen fuel cell technology), but they would be real "prototypes" in that they would have to be based on a one-off, road-legal car. A series for concept cars, if you will, that would at least give the impression that the improvements made on the track trickle down to normal road cars.
Now tell me that wouldn't make sports car racing the most popular form of motorsport with manufacturers and fans.