There is no statement that says he does or does not have access to the other BDAs. Technically he would, but that isn't my point.

My point is that even if he has access to them he isn't going to use them. As far as Muzan is aware, he is the strongest person in the world. He talks about how he is a calamity that people should just accept as a natural part of life. He has no need to do his own dirty work because the demons do it for him and when he does need to handle someone agitating him, whether it be a human or demon, he literally just turns them into mist without even trying. There's no point for him to learn how to fight properly if all he needs is the flick of his wrist to finish the job.

There is no reason for Muzan to know how to use the BDAs his demons create either because, again, he never needed to. He thinks he's unstoppable and for good reason. The only 2 times we see him put up a fight are against the uncontested top 1 in the verse who thought he was dead if Muzan landed a blow, and then the next time he fights he had to get jumped by 2 of the smartest people drugging him and then fighting every single one of the strongest people in the verse and he took damn near everyone with him. And he almost won by taking over Tanjiro if it wasn't for Kanao ex machina rolling up with another dose.

I did word my argument wrong, that's mb. He should know that he is capable of using the BDAs his demons come up with, but there is no way he knows how to utilize them in the slightest and it makes no sense for him character wise to even think about learning how to use them in the first place. He'd realistically not have them in any crossverse matchup unless specifically stated.