In the German store page HDMI 2.1 is mentioned, as well as "lossless audio from game consoles" via eARC.
See the HDMI version below:
Here it basically says it supports automatic game mode:
"Intoxicating sound for your games
Game Mode Pro
Prepare for intense gaming sessions with subwoofers and up-firing speakers that deliver stunning surround sound. The soundbar automatically switches to Game Mode when connected to your TV, so you don't need to adjust any settings and can concentrate fully on your game."
And here "lossless audio" via eARC
"HDMI eARC
With HDMI eARC you can listen to lossless, high-quality sound even when connected to other devices such as DVD players or game consoles."