your email mixes up SyzyASan and "normal" address sanitizer.
Address sanitizer is a memory checking tool based on compiler instrumentation with a custom runtime, documented at http://clang.llvm.org/docs/AddressSanitizer.html
It was historically first implemented in clang, but I think gcc now also supports instrumenting code with it (using, I believe, LLVM's address sanitizer runtime). If you use clang, you can use address sanitizer on Windows that way. We use this setup to fuzz chrome on Windows.
Since clang used to not work on Windows, SyzyASan is an alternative implementation of the same idea. It uses syzygy to instrument the executable after compile and link have already run, and it has its own reimplementation of the runtime. I believe we sometimes send out SyzyASan chrome binaries to the canary channel.
So answers depend a bit on which of the two you're asking about, but as far as I know both are functional at the moment.