It does decode DTS, Dolby. Here’s a snippet from the product sheet I received by email.
RENDER
DOLBY Atmos® DTS-X®
DECODE
DOLBY® - Dolby Digital, Dolby Digital Plus, Dolby TrueHD, Dolby Surround (from Atmos)
DTS® – DTS, ES, HD Master Audio, HD High Resolution Audio...