Being confused is not particularly useful. One of those articles is old and the other mainly has a sensational headline. There's no evidence in the text that the writer knows what a keylogger is, but he does say "Click Turn Off and you’ll be free from the watchful eye of your own PC". He doesn't say "Click Turn Off and you’ll avoid having all your keystrokes stored on a Microsoft server."
In passing, yes, there was a keylogger in the Technical Preview version of Windows 10.
In passing, yes, there was a keylogger in the Technical Preview version of Windows 10.