It's not the new APIs that are the hillarious thing (MS has a bazillion of them anyway) but Microsoft's repeated declarations that everything until metro/modern/winrt/ua/uwp/wtf is legacy and dead and what not is the funniest thing I've seen in IT for ages. It beats Stallman's foot fetish by a wide margin.
Win32 is still around obviously. They need to keep it around so that the suckers who bought into proprietary years ago can't escape. I wouldn't surprised if Microsoft soon forces a special "legacy" version of Windows that is like four/five figures per desktop license cost just to drain all the possible money from the suckers. Consider how much Microsoft got paid for extended support for Windows XP. Taking advantage of API locked in organizations by forcing them into license agreements they can't refuse is not a new Microsoft invention by the way. It's a classic from all the major platform vendors.
But Microsoft must be seen as de-emphasising of Win32 for the same exact reason they are keeping it around. Win32 is a major point of contention. As the case with any fully proprietary platform, it forces you into a potentially abusive business relationship essentially for the life of your software. The biggest fear of non-Microsoft IT decision makers is right there. Even those decision makers thinking in the short term mostly aren't that stupid anymore. Microsoft can not be seen as promoting lock in if they are to grow.