If it’s not satire, then calling it “malice” is too on-the-nose.

That looks like it should work. Just a couple of thoughts: The default gateway is irrelevant. That’s only where the OS sends packets that don’t match the netmask. Since these addresses all lie within the same /24 range, the default gateway will never be used. It wouldn’t hurt to check the ARP tables of each OS to see whether the VM MACs ever show up on the remote host or VM. Are the two hosts connected with a cable, or via WiFi? If the latter, VirtualBox has to do some software trickery to make bridging work, and I can imagine that perhaps some WiFi devices wouldn’t play nice.

So the LG TV can get connected to the local network without an app or cloud account? Perfect! I guess HA integration for a soundbar would be a nice-to-have-feature, but not critical. It would be nice to have Music Assistant connect to it directly for music playback, but as long as it turns on and off via CEC, I can continue to play music through Kodi/LibreELEC.