Yes he seems to have income from somewhere else, otherwise its not explained. All his AoT songs have been some kind of rearrangement of Guren no Yumiya and Bravely Default 1 ost was before that, and there was almost nothing after it.
Unless there's something happening on my side with playback of these so called "UHQCD"s, I'm gonna say the "Re:Master Production" reissues are shite based on the album I just got. There's even more compression and clipping than on its initial release (after looking at the waveform, I think they just applied more gain and called it a day - it flatlines at 0dB for multiple samples all over the track I checked). I'm incredibly disappointed.
Only buy them if you feel the need to support SH no matter the quality or must have them on your shelf to look pretty. They do look pretty.