Since I have not seen the specific ad I don't know if this applies or not, but it is common where I live for rabbits to be advertised when they are young so people can put them on hold, but they are not released to be taken home until they are older.
This happens often with show breeders who allow people to reserve rabbits of a certain breed/color/gender.
Anyone who has ever bred rabbits can clearly see they are not cute enough to sell at two weeks, nor able to leave their mother. There is little to be gained in selling people a rabbit that is certain to die, word of that gets around fast.
I am hoping that is the case in this situation.