The rumour says it uses the arcade samples, sometimes mix them a little bit and you just make the promts to find them. So not fully AI. Someone might want to have unique samples that no one else have. This might not be for them if the rumour is true. But it's free and there are good sounds.
the problem is that you were requesting individual parts, you should have just prompted for a whole instrumental sample that has all the parts but I get what you were trying to do and for that Splice create is the better tool.
There is an article on BPB and in the comment section people was talking so. I don't know is it true so I called it rumour. I only know it gave same samples again many times after different key words. So at least it doesn't create new sounds every time. So I think the rumour might be true
From outputs website “Co-Producer AI curates, combines and often re-synthesizes samples from our meticulously crafted royalty free library to generate entirely unique sample packs. The model only utilizes our library of sounds.”