there were alot of incidences where Dre was accused of taking credit for beats he didn't make, but listen to the song. regardless of what Daz says, that is a Dre beat, through and through.
the whole "who produced that track?" question when it comes to Dre is so misleading, mostly stemming from the fact that in hip-hop, producing is totally different than any other form of music. a rock producer, for example, doesn't write the music to the song, he leads the recording and mixing process and his job is to get the best sound and recording possible from the artist/s they are working with. but in hip-hop, a producer is seen as the one who makes the beat. so it really depends on how you look at it. Daz may have made a lot of the beats when he was on DR with Dre, but in the true sense of the word, Dre PRODUCED every track he got credit for producing.