MagniFi MAX SR Does it support LPCM5.1?

Through the test, the output audio of Nintendo Switch is
LPCM5.1
LPCM2.0
The Switch is connected to Polk MagniFi MAX SR via HDMI, and the surround 5.1 audio is tested. The output audio is LPCM2.0 channel, but it cannot output LPCM5.1 channel.

Does Polk MagniFi MAX SR hardware support LPCM5.1 or through firmware upgrade, thank you!