You are correct that his YouTube channel is heavily biased toward Eminem.
But I don't think it's because he's a "dikkrider." Like most people trying to build a YouTube channel, he's probably biased to what his subscribers request and what videos get views. The Eminem videos get the most views and comments are flooded with Eminem or Eminem-related requests. If Rakim, BDK and etc were heavily requested and highly viewed I'm sure he'd do that.
I might be wrong, I guess. He praised Eminem, yeah, but from what I watched, the songs he picked were worthy of praise, no? It's not like he picked Fack or Touchdown.
I watched a handful of his videos so idk. I'm new to this "reaction" stuff. It was kinda fun at first to see someone react to a song I know. But all he does is stop the song at a punchline and play airhorns and give a Jim-face to the camera and say pithy generic things. It ran its course pretty quickly and I got bored with it.