High end offerings from both LG and Samsung have nothing more than HDMI 2.0+eARC+HDCP. LG put "HDMI Ports support HDCP 2.3 up to 2160p@ 60fps (4:4:4Dolby Vision, HDR10)" on their product page for the SP11RA.
I think that from LG is correct though? HDCP 2.3 is a totally different protocol to do with copyright protection. Remember the HDMI 2.0/HDCP 2.2 fiasco about a decade ago when people bought HDMI 2.0 4K TVs only to find the l new HDCP standard required for 4K from BD players etc a bit later wasn’t supported?
4K/60Hz and the other stuff detailed isn’t saying it will do 4K/120, VRR, ALLM etc which are features of the HDMI 2.1 standard. eARC and a couple of those are able to be added to HDMI 2.0(b) standard sockets within the 18Gb/s total bandwidth of that standard.
Manufacturers are not permitted to call their sockets an HDMI standard number, nor a cable by that number either. So many do it causes confusion. The latest Samsung’s here in Australia I think say what HDMI 2.1 features are supported which is absolutely what they should say.
Just because eARC and maybe even VRR is supported doesn’t make it an HDMI 2.1 socket. As noted many times here no soundbar has full featured HDMI 2.1 sockets yet - not even the 2021 models. TVs do so if you want those high end video features you rely on the TV passing full audio via eARC. If you want high end audio codec support you rely on the soundbar to pass high end video.
eARC support between manufacturers is highly variable. There appear to be issues with how two devices can identify each other through HDMI and certain audio needing bizarre or missing setting in the TV to passthrough.
I guess soundbars are to deliver the best audio possible with things plugged into the inputs, and in theory eARC is supposed to be the way to deliver full fat audio from the TV that supports the high end video features.
HDMI-CEC is also an optional feature since almost “forever” and that still doesn’t work well. Each manufacturer takes it and remakes it and useful features simply don’t work. Or work so well inputs are changed on each device several times and then one of them powers off