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Your device was never supported by LineageOS officially. The old 14.1 version seems to be an unofficial version which means that typically one developer who owns the phone implemented the necessary changes for making LineageOS work on your device, but if those changes were ever published is unknown.
Why there are no newer versions is unclear, may be the ...
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When I understand the Wikipedia article on NFER correctly this requires special hardware that is not yet present in Smartphones. Therefore this questions seems theoretical to me (which means that it is Android independent).
Regarding your question what other technologies can be used to detect devices in the same room I would like to reverse the question:
...
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Data store by the gallery apps are thumbnails it generates to preview the pictures and videos. The Gallery app can be considered as a movie theater where you go to watch a movie (in your case, viewing picture and videos in your phone). If its goes bankrupt (in your case deleting its data), it won't stop you from going to another movie theater.
Furthermore, ...
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If the phone is really shut down then it is irrelevant if the sensors are working or not (typically I would assume that in device off-state the sensors are not powered).
Sensors provide real-time data. If no-one retrieves and saves it the data is lost.
Therefore in device off state no app is running to retrieve the data and thus no data can be collected (...
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I still don’t know where the files are stored, but for others with same wish for text file-backups, the app: "Playlist Manager" can do the job.
It basically has a "Share A Playlist" function which allows you to share in text format.
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