That’s… odd… Dolby Atmos for Home Theater is implemented as a system-wide audio output format in Windows, meaning ‘’all’’ sound in Windows that gets played will be encoded to and outputted in a Dolby Atmos stream, whether its spatial or not.
Games do not actually engage that output format automatically — the user has to enable it manually in Windows before starting the game.
So based on that, and the actual note on the page, what I think the editor actually tested was the typical supported surround sound/channel layout of the game irrespective of Dolby Atmos, which would be used when Windows is configured as using a normal 7.1 output stream, and not a Dolby Atmos encoded stream.
Btw, this is also how DTS:X for Home Theater is supported — Windows adds a new supported audio output format beyond the normal Stereo/5.1/7.1 layout and 44/48/192 kHz sound formats that can be used when connected to a DTS:X compatible device.