People do not detect as their alignment unless they're level 5 or higher. Mortal alignment just ain't that strong. Natural weapons and unarmed strikes aren't any different from manufactured weapons. Unless it says otherwise, it doesn't bypass anything. There are several feats and class features that change this.
Easiest way to see this is monk, who has this:Ki Pool wrote:At 10th level, his unarmed attacks are also treated as lawful weapons for the purpose of overcoming damage reduction.
Monks must be lawful. If their strikes already counted as lawful, why would they give this to them?
The line about alignment subtypes is about creatures made of <alignment> like devils and angels. Basically just outsiders, honestly. They bypass their alignment subtypes with both their natural weapons and any weapon they're holding.
Yeh, I get that alignment and subtype are not the same. And alignment subtypes are what grants the ability to bypass DR/alignment. And most humans are made of human, and most elves are made of elf, etc... humans are not made of "good stuff from beyond". Got it. Thanks.