I've just bought the album on iTunes.
Sorry if I sound like an heretic, but my take on it is:
1/I like his cover of DS songs a lot. A new, refreshing take on them. Maybe not the best ever, but quite pleasant. I'm listening to Private Investigations now and I love it ! a bit minimalistic, quiet, but nice.
2/He is fully entitled to play DS songs, he was a (great) part of DS... this low profile man has always lived in the shadows. Why could't he take a bit of light now ??
Only strange thing to me is: why 4 songs from his first modern solo album and only one from the most recent one ??