[chester24]

But if nothing here is pulled from the filenames, other skins seem to do it, it makes no change anyways.

There lies your answer. This skin does not pull Atmos/DTS-X from file names but some skins do. It relies on what is provided by KODI yet the scrapers don't add Atmos, DTS-X to the library. I understand that these are not REAL codecs, but its the only way to make the skin display them. People have different preferences and that is fine. I don't mind adding Atmos as a false codec to my NFO files but it seems you do. For me, it does not change how the audio is decoded or passed through and the inconvenience is therefore negligible compared to the added functionality.

Sorry, I misunderstood the DD plus thing. I thought it was not displaying at all. I missed that part that only DD plus Atmos doesn't display.

As much as I would love for the skin to pick the flags from filename, I am not going to pressure the skinner to do it. He has his own reasons for not adding this functionality and am comfortable with the workaround. I will let him add whatever he wants to add at his own time. All we can do is request a feature and wait, if he says yes, then Hoooray!! If not, we go on without it. 

The real true solution though is for KODI to add these flags to the library. This way, we can even create smart playlist based on Atmos. This needs quite work because so far, KODI also ignores other things like sources e.g like Bluray, HDTV, DVDRip, WEB-DL and many other important flags. You said you can write python script to populate your nfo files with atmos, this makes me assume you are good in writing code. If you have the capability and time, maybe you can do a pull request and add this functionality to KODI core, many of us will really appreciate it .

For those for us who are too lazy to learn to code, we have to wait patiently and find workarounds until problems are solved or features are added.

Hey, yes I also do not want to pressure the skinner to do this. I was just asking and then realizing on your answer that what happens by the Kodi scraper is wrong, namely accepting Atmos as a Codec. And I also totally understand what you mean in terms of everybody's priorities. 
Well, although I code since I was 6, and this was in a time where not everyone really had a computer, 37 years back in time, I have yet to see if I have the time for it
I totally agree that it should be done by KODI core somehow so not every skin has to have its own way to do it, like one takes it from the filename, the other don't. But yes, it seems like this is the state now.
I will leave my .nfos "correct" for the time being, it does not break anything getting no Atmos logo displayed, so...