[2] and [4] sound like manual clock/voltage configurations, not the automatic OC of modern AMD CPUs or included XMP Profiles. Those are configs the manufacturer provided.
Overclocking has always voided warranties, it's why overclocking has traditionally been the realm of enthusiasts and tinkerers who generally aren't concerned with reliability, safety, or monetary value and know what they're doing.
The more mundane users really should be made aware that overclocking is tantamount to playing with fire, sometimes literally.
AMD themselves also make it clear that users who overclock "assume all risks and liabilities that may arise out of overclocking and/or undervolting AMD processors" per the footnote on their EXPO page.
Overclocking will void warranties, this is a fact that anyone who wants to overclock has to accept. AMD should be ashamed for hiding the literature behind a hidden footnote, but that doesn't excuse end-user ignorance.