He hasn't been silent at all, that's all he is talking about.
The thing, in my opinion, is that the goal of billion hero challenge is really big and audacious, and in order to succeed, it has to be as smooth of a ride as possible. Stuff like that takes a lot of time to prepare and organize.
If you read this post: https://steemit.com/bitshares/@ravid/few-clarifications-from-stan
You'll see that currently all the hype and promoting happens only here, in front of the local community. They will start working on gaining media attention in coming months, after they switch to the new website