On my network, I use the following script to convert the hosts file he provides into an unbound config file which I include from my main unbound config, using this script:
I don't specifically know the services the TV expects from those domains but:
You may want to receive software updates for the TV.
You may also want to access services that the are launched by the LG apps. Those services may only run correctly when the appropriate pre-roll advertising (quite possibly from Smartclip) are allowed to play.
ad.lgappstv.com
yumenetworks.com
smartclip.net
smartclip.com
smartshare.lgtvsdp.com
ibis.lgappstv.com