This never got fixed for me; same files I provided still have the misrendered subs issue, even today:Nvidia Shield TV: Mis-rendered VOBSUBs (MKV, MPEG2) & Nvidia Shield TV: Mis-rendered VOBSUBs (MKV, MPEG2)
I raised this issue in 2017. I’ll move over to Apple TV at some point anyhow.