It is not guaranteed, but almost all screens with 72% NTSC coverage also have around 99% sRGB coverage. Screens with 92% NTSC coverage tend to be right around 99-100% Adobe RGB coverage.
While it is true in theory that the specific 72% of NTSC colors that a specific screen can reproduce might include a significant portion of Adobe RGB colors that are outside of the range of sRGB (and thus leave out the same amount of colors within sRGB), it is also true that a screen that can produce 99% plus of sRGB and not much else will score around 72% for NTSC.
Manufacturers that design models with colors that cover significant portions of the range of colors beyond sRGB are usually going to desire to get as close to Adobe RGB or other standards beyond Adobe RGB (DCI-P3, Rec. 2020, etc).
Screens that are measured by independent testers who test for both standards almost always report 98-99% sRGB coverage for panels that score around 72% NTSC coverage. Screens that are measured at around 99% Adobe RGB coverage almost always also are tested at around 92% NTSC. So I'd say it is a pretty safe bet for around 99% sRGb coverage to be the case with monitors listed as "72% NTSC". I'd also sy you're pretty safe that monitors listed as 92% NTSC give around 99-100% Adobe RGB coverage.
Selecting a monitor tends to work best by selecting a specific color space with which you desire to output your work and then finding a panel that matches that standard well. Most good monitors are designed to get pretty close to one of the most common standards (currently it's still sRGB followed by Adobe RGB and then more exotic spaces) and not much more than that particular standard. What good would it do to have a monitor that can do around 99% of sRGB but only half of the additional colors contained in Adobe RGB? It wouldn't be any more useful than a screen that can only show 99% of sRGB and not much else.