It might not be missing as such if there were only engine updates then there may not be an entry for it. The actual VPS Updates does more than just virus definition updates. This has happened in the past, but as Pondus said sometimes the web page isn’t updated as quickly as it should.

But it doesn’t help clarity of what has been updated. Now with streaming updates, the VPS updates are not as critical as before and I guess that too would include the VPS update webpage.