Can you try this alternative solution: soundcard regression (9.2 => 9.2.1) - LibreELEC Forum
In your BIOS, disable "HD-Audio DSP" as it's not required (won't be used by LibreELEC) and is in fact the reason why the audio is misconfigured in the kernel (which then has to be fixed by blacklisting the unwanted DSP driver that the BIOS option has enabled).
worked on my NUC7PKYH2
Thanks!