I like to think that "almost" is a sarcastic jab at those who foolishly supported the HD-DVD standard early on. Although it was probably drafted by marketing people that have no idea one way or another actually.
Playback Capabilities
Disc
Ultra HD Blu-ray, BD-ROM, Stereoscopic 3D (profile 5), SA-CD (SA-CD/CD) Playback, DVD-Video, DVD-Audio, DVD-R, DVD-RW, DVD-R Dual Layer, DVD+R, DVD+RW, DVD+R Double Layer, CD (CD-DA), CD-R/-RW
Audio Format
AAC (.AAC, .mka), HEAAC v.1/v.2/level2, WMA9 Standard (.WMA), LPCM (.mka, .wav), DSD - DSDIFF/DSD (.dff, .dsf), FLAC (.flac, .fla), AIFF (.aiff, .aif), ALAC (.m4a), Dolby Digital (.ac3, .mka), WMA10 Pro, Vorbis, MP3 (.mp3, .mka), AAC (.m4a), Monkey’s Audio