The thing is that he doesn't have to help the prosecutors when he's called to testify, he can plead the fifth or claim ignorance.He said everything the prosecution needed him to say and has agreed to testify. My brother... that's snitching. This puts hella pressure on anybody awaiting trial. We'll probably see a chain reaction of plea deals now.
Unless he's already given them a detailed statement behind the scenes that could be used to prove guilt, this isn't enough for me to call it snitching just yet.