NTSC is just one specific implementation of analog color video transmission, has nothing to do with CRT functionality outside of North America/Japan/a few other places and generally when speaking about CRT monitors for computers, arcades and the like they operate on discrete RGB signals with a wide variety of timing: https://en.wikipedia.org/wiki/Coordinated_Video_Timings, NTSC isn't a thing.
Furthermore, even when using NTSC video timings, the 3.58 MHz subcarrier is specific to transmission of composite video (carrying brightness and color combined in the same signal). A DVD player for instance with a component or SVideo output produces NTSC timing but there is no subcarrier because the color signal is discrete.
Furthermore, even when using NTSC video timings, the 3.58 MHz subcarrier is specific to transmission of composite video (carrying brightness and color combined in the same signal). A DVD player for instance with a component or SVideo output produces NTSC timing but there is no subcarrier because the color signal is discrete.