It's definitely him - he's got the exact same birthmarks that Shamuon does (moles on his left lower eyelid and right of his nose). If it's not Shamu, it's his doppelganger.
And to add on to that last post, he shares a Twitter account with other members of his agency (that he literally just joined at the beginning of this month, not just in the last 5 months). Every tweet signed with Tomoya (朋弥) is him! They stream on twitcast from time to time too, apparently. And this is probably no surprise to anyone, but he's still cute .
But I'm just happy that there's some concrete evidence that he's alive and well. ;_; The fact that we might get to hear Shamu's voice in an anime though...