J. Cole's 2018 album KOD has moved 1.1 million units.  273,000 of those were traditional sales and the rest streams.

That's actually a pretty low ratio of sales to streams compared to most Hip Hop acts these days. Drake's Scorpion was the number one album of the year with 3.7 million SPS and 308K traditional sales. Post Malone's Beerbongs & Bentleys was number two with 3.05 million SPS and 343K traditional sales.

Cole doesn't mention Drizzy or Postie in his feature on the 21 Savage track "a lot." But he does call out artists who he says "fake" their streams. 

"Question
How many faking they streams? (A lot)
Getting they plays from machines (A lot)
I can see behind the smoke and mirrors
Niggas ain't really big as they seem (Hmm)," he raps.

Who do you think Cole's talking about?