Real talk, what did he mean by "rap will never be the same

"Rap will never be the same as before" is a braggadocious line generally characteristic of hip hop music, where Eminem is implying that his return to the genre will change the landscape of things to come.
Eminem self-deprecatingly refers to himself as "Pinocchio", poking fun at his over-the-top and often outlandish claims he's made in prior lyrics throughout his career