No, there are no deleted posts. I'm gonna let you in on a little secret: those of us on mod staff can see the deleted posts. They look something like this:
That deleted post right there is the one you made like 9 minutes ago, something like "is it just me or did a lot of posts from this thread get deleted?"
Now, sometimes people hard-delete posts/threads. That's where those of us with administrator privileges come in. We can see when/if people do that. So I'm going to reiterate, there are no missing posts
from that thread.