If that is what he "expects" then he is clearly ignorant of the history of Apple and open source. The Apple Public Source License, Version 2.0 predates the GPLv3 by years and it includes a patent grant[1].
At one point Apple actually wanted to merge the entire of llvm into gcc, and were prepared to non-assert and patents that might be involved: https://news.ycombinator.com/item?id=8868994
Given the success of LLVM since then, it doesn't make much sense to merge them now. The GCC maintainers would demand the removal of a lot of the key selling points of LLVM that have made it so popular among language designers, researchers and academics (the modular architecture, libraries that expose the AST etc).
There are many reasons why it's unlikely to live at opensource.apple.com, here are some of them:
First off, some frontend features are only feasible by changing LLVM itself. This is uncommon but ultimately not rare at all, this is where IR features like musttail, inalloca, safestack and segmented stacks originated. It is unlikely that swift will never need such a change.
Secondly, it would directly contradict what Chris Lattner announced at WWDC: They are going to accept contributions (both ideas and code) from others.
Finally, a frontend which generates LLVM IR has a very tight dependency on LLVM itself. LLVM IR is allowed to freely evolve which, in turn, causes APIs to change or disappear. It is much easier to deal with this if your code lives on llvm.org because the community is obliged to make sure your code continues to work. People fix polly, lldb, clang, etc. if their change to LLVM broke them.
> Apple's announcement remained completely silent on patents, and we should expect the chosen non-copyleft license will not contain a patent grant.