This thing? Doesn’t the ‘P3’ confirm it?
No, because you are in the generic “profiles” section, and it simply lists all registered profiles. ColorSync usually shows the actual devices.
So ColorSync → Devices → Displays, then open the factory profile. Click on the rXYZ, gXYZ, or bXYZ tag. A larger triangle will likely appear, with different primaries to sRGB.
That’s it, and that’s definitely Display P3, not sRGB-like!
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Oh man. I’m very curious about what made you go so deep into this ‘rabbit hole’. Is color science your strongest inclination?