> I never re-ran the above command.

The alsactl restores all audo controls after boot, including this one.

> Unfortunately, the result of the below command are as follows once audio
> breaks:

Please try 0x38 instead of 0x70, and if still not found, try 0,1,2,4
instead of bus 3.

If you still not found, please send your acpidump output.

> For testing purposes, if I want to enable/disable your workaround
solution, would changing the 1 at the end to 0 be sufficient?

Yes, setting it to 0 disables always reloading.

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  [Lenovo Legion7 16ACHg6 82N6, Realtek ALC287, Speaker, Internal] No
  sound at all

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