smartmontools-7.5.dmg is the latest official release of smartmontools for macOS and it installs into /usr/local/sbinI guess it depends on how installed, but mysmartctlis in/usr/local/bin. This is, of course, the same information as provided by DriveDX. If DriveDX does not show it, then smartctl doesn't.

https://www.smartmontools.org/wiki/Download#InstalltheOSXDarwinpackage
- smartmontools is free, DriveDx is usually $25
- smartmontools has been updated on 12 May 2025. The latest release of DriveDx is from 25 September 2023.