I don't think this is the case – the article mentions that this is explicitly related to the "bedtime" feature, rather than the more general "alarms" feature.

I don't think this is the case – the article mentions that this is explicitly related to the "bedtime" feature, rather than the more general "alarms" feature. I use this feature as well, updated to iOS 14 last night without changing anything or updating my settings, and the alarm still went off this morning – so it at least seems like it's a more complex failure that it might first seem.