Eminem sometimes “bends” words, pronouncing them in a way that makes them sound alike even if they don’t normally rhyme. This technique can be seen in “Lose Yourself,” when he rhymes:
“arms are heavy”
The words “arms” and “Mom’s” do not have exactly the same vowel sound in the middle, but he pronounces them so that they work together as a type of rhyme.
With Eminem, he makes words rhyme that typically don’t rhyme together—he’s good at that. It’s about how he pronounces it.