It works. Here's why.Look at PB's post about the steam news
HERE FOR ALL YOU LAZY FOLKS...
The Source SDK is being phased out for all Valve games.
So unless you have created your own mod with the SDK, DON'T USE IT ANYMORE!
All the tools are still available, they're just not in the SDK launcher anymore.
YOU DON'T ACTUALLY NEED THE SDK BASE 2013!!! You just need the game you want to map for.
Head to the
Steam - SteamApps - common - Half-Life 2 - Bin folder and you will see hammer, faceposer, model viewer, and all related batch files.
Valve suggests launching the games with the batch files. They also mentioned deleting any existing environment variable related to Vproject. On one of my computers, the batch file actually works, and on the other, it doesn't.
Regardless, if you launch the app or the batch file, hammer (or whatever tool) will start and you should get a prompt to use a certain game configuration.Make a test map, compile, and you will see that everything works fine!