Not defending the guy in general, and certainly Scientologists tend to be anti-vax, but this specific comment doesn't seem to be accurate - at least I couldn't find this via Google and I don't recall him ever speaking out against vaccines (unlike other celebs).
Again, not a defense of the guy in general, as there's lot of disturbing stuff about him.
That said, the notion that this was leaked by the church of scientology as a PR move is a leap to conspiracy theorizing, as there isn't *any* evidence that this is the case. Happy to be wrong, of course - but I think the world could do with a bit less conspiracy theorizing at the moment.
You know you could actually be right on this. I'm not sure why I have been remembering vaccinations as part of his condemnations, could be from another celebrity in Scientology. Could also be from mixing it up with Cruises rants about ritalin and antidepressants.