For those wondering like I was, I can now confirm that yes, the built-in Netflix application on LG C8 television does pass through Dolby Atmos soundtrack over ARC connection without any issues. There are occasionally connection issues with some Dolby Atmos demo videos, but there are no problems using the built-in Netflix application.
I am extremely happy with my purchase and two months in, it continues to exceed my expectations for it. Highly recommended!
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