It would be much better as a founder of the forum to come out and give news about the project he created.
I do not think that he will afraid to get a swarm of posts coming in his future thread. If he's afraid to receive PM then he an disable the PM on his profile.
Satoshi should be happy that after 10 years the technology he build is doing great that has been put to good use in my opinion.
This is only possible if he is alive. Who don't like fame in this world ? I think he may not be alive because if he was, he would have stepped forward and become the most popular personality by now. Also when there are so many fake Satoshi around us, he should have reveled himself.