Monthly listeners can be misleading. Don't differentiate between someone listening to 3 of your tracks or 30. So it's no surprise Busta has a lot of monthly listeners. First ten years from his solo debut he had 5 platinum albums and two gold and outside Anarchy they all had at least one massive hit. His albums may not have been going 3-4x plat but he was a hit making machine far as singles. Far as being timeless, most those tracks hold up extremely well.
I agree that monthly listeners can be misleading, which was part of my point to begin with. Streaming itself can be misleading depending on how you're applying the information. In your case, it was to how timeless the music is, which is misleading because there are factors that affect streaming that have nothing to do with how timeless it is.
Regardless of how many hits Busta had in the 90's, he is still outstreaming contemporaries who sold far more than him in the 90's and the '00's. There isn't a rhyme or reason as to why Busta is out streaming DMX and Nas even though they sold considerably more in the 90's and '00's than Busta even when he had bigger hits. Again, if we went by your logic, his music is more timeless.
2001 is an iconic album and definitely a timeless one too. It's also about as new as a 90s album can possibly be since it dropped in November 1999, that's another factor. Regardless of what the charts say about singles you heard that album everywhere at parties and playing out of cars through summer 2000 at least and a lot of those songs still loved and well known 20 years later. It has the Eminem factor too. A lot of these Eminem stans barely listen to rap outside Em but they fukk with 2001 and 50's first two albums because of the connection
Do people really look at 2001 as an iconic album though? If people gave a list of Top 50 albums from the 90's, I don't see that one cracking it. I think 2001 is a classic. It's definitely one of my favorite albums, but I still see a lot of albums that people would put in front of it. I mean, even on here, there's people who have argued that it's not even a classic.
I don't see the Eminem factor playing much into that. The biggest song from the album doesn't even feature Eminem.