It sounds like Lucasfilm has specifically asked Oz not to say anything.
The first part of what Frank OZ says is certainly ambiguous.
However, his last part of the statement, that he’d be happy to talk about “it” once he can, certainly seems to state that there is, in fact, an “it” to talk about.
While they certainly would have asked him to stay quiet after doing any work for them, the way Oz says it, sounds like Lucasfilm may have reached out to ask him to say nothing even if nothing is actually happening.