The post mentions iOS a few times. You might be accidentally mistaking a platform for a language target - Haxe generates C++ (which can be used for iOS). That C++ is usable anywhere with any compiler toolchain. The backend (hxcpp) comes with a bunch of toolchains already set up, and builds against the iOS toolchain for you without a problem (armv6,armv7,armv7s,arm64 and simulator i386, x86_64). It also includes a few more obscure ones like WindowsRT, Blackberry, Tizen and so on.

(It's actually all right there in the link :))