I spent the last 4 years using Google's Clock app, where you would cancel the alarm by swiping to one side or snooze it by swiping to the other. So when presented with a button that doesn't respond to a tap the next thing I tried was a swipe (to be honest that's what I do with Android generally: if it's not clear try tap, harder press, swipe until one of them works

).
If Samsung did change the interaction without changing the appearance that would be dumb, but it wouldn't be the first time that a big corporation made a dumb change (Google are certainly guilty of a few).