Unlike the widget described in the article, it doesn't snap in 5 minute increments for the minutes, which makes it a bit more finnicky, but otherwise 6:15 am is just a tap at 6 (south) and 15 (east).
It's still not as bad as the Samsung and iOS vertical dial with 60 options, though.
My old Symbian phone (pre touch) allowed to just type the desired alarm time on the keyboard. I could blindly set an alarm. Those were the times...
That being said, in the alarm clock dialog, if you add a new alarm, there's a button that allows the user to type in the time using a keyboard (there's a keyboard icon to the bottom left), the first tap allows you to select the hour (shows both 0-12 and 13-23 if the locale is set to 24 hour clock), another tap will select the minute. If you're on 12 hour clock, you may need to change between AM/PM by tapping it. Tapping either the minute or the hour will allow changing that value.
Other than having the 5 minute snap on tap (as TFA points out, who really wants an alarm at 6:01 or 5:59?), it seems as if it allows all possible interactions, where the user can pick whatever input modality they want.