Another oddity:
When decoding this DTS-HD MA track, there is some kind of contradiction in the log output of eac3to: on one hand, libDcaDec is allegedly outputting 16 bit data, however the resulting PCM file uses all the 24 bits according to eac3to at the same time.
In any case, the output at least matches the ArcSoft decoder's. Yet again, I don't know if it's really lossless or not.