While not necessarily a direct answer to your question, whether an optic is "NV compatible" often has to do with the amount of ambient light and incidental illumination.
In more brightly lit areas (all things being relative), e.g., full moon, clear sky, or urban areas, many more optics are "NV compatible," including ones that are not necessarily advertised as NV compatible, and/or ones that auto-adjust to ambient lighting conditions and are faintly visible without NVDs.
In much darker areas, like, say, little gullies in the mountains of West Virginia... any visible reticule will be too bright to use with NVDs, and even with dual tube devices, you will have difficulty acquiring targets past the bloom, and you may as well forget it with a single tube device.
Ultimately what I've found is that a lot of sights advertised as "NV compatible" only really fit into the first category I've described above--not into the second. Same with users reporting that "non-NV" sights work with NV.
How significant this ends up being to you will often depend on what you intend to do with the weapon/optic combination. In the case of pistols, for me, a pistol is primarily a defensive tool, that especially at night, is expected to be used at close ranges in an emergency scenario, when all the stealth that my NV was supposed to afford me has failed me. At which point if I'm drawing the pistol, someone's probably got lights on somewhere, I may be activating white lights, even while I "work through" the NODs, or the target is close enough and moving so the bloom is less of an issue or... etc. If I were intending to use my pistol in more of a "covert" role under NODs, at this point, I'd probably be using the Glock with the 6SM--and the "true" NV compatible T1.
I know that the above may apply less to the case of a "rat popper," but something to consider vis-a-vis "NV compatible" optics versus "non-NV compatible."
~Augee