Dolby Atmos support without Dolby TrueHD means TrueHD tracks with Atmos will play without it. If those are the codecs it supports that means it'll only stream Atmos when it's Atmos encoded over Dolby Digital Plus, which to be fair is what e.g. Prime, Netflix, and Disney will stream to you anyhow, but it doesn't help with watching my rips.
For audio it says it supports "Dolby Digital, Dolby Digital Plus, Dolby Atmos", so I guess we can only assume that means DTS-X is missing.
But supporting HDR10+ a nice win over the shield, and it also does support the necessities like HLG, H.265, H.264, VP9, and AV1.