Since the Lightroom 13.2 update, Nikon NEFX Pixel Shift photos are supported. Does LRTimelapse support this as well?

Didn't care about them yet, does lightroom support that?
Which benefit would that have for Timelapse which will be exported as video, where even 8K resolutions can be obtained with regular raw files?

Yes, it is supported by Adobe. I want to do 16K timelapse....

Currently it's not supported. But you might file a feature request in the feature request forum.

I implemented support for NEFX files in the latest beta: https://forum.lrtimelapse.com/Thread-lrt...5-5-beta-1
Download on https://lrtimelapse.com/download/beta