No bro. You've mistaken. The signed a contract with only Warner Chappell ( Subsidiary of Warner Music Group) and not with WMG. Warner Chappell doesn't includes artists like Led Zeppelin, Coldplay, Linkin Park, etc. It only includes two major artists : Katy Perry and Kendrick Lamar.
Oh-k people! According to press reports Spotify seems to have reached some licensing agreement with Warner Chappell which includes India. Here's hoping I see my favourite bands/tracks from Warner Bros catalog online.
You're mistaken my friend, as a proof go look over to Led Zeppelin's Spotify Page, it's written they're working hard to get more music to this region, meaning they're in the process of adding every artist's song who's under Warner Music Group as it wasn't there till yesterday before the announcement.