Oh! My God!I have found some papers from Philips Technical Review back in the days, discuss Delta modulation and why it is preferred, nothing new I'm sure, but may by able to give us more context without guessing.
Quantizationa and coding of analog signals
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pearl-hifi.com
D/A conversion in playing a Compact Disc
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pearl-hifi.com
Digitization of speech
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pearl-hifi.com
A digital 'decimating' filter for A/D conversion of hi-fi audio signals
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pearl-hifi.com
feel free to read more, index included, I hope someone can put this collection onto archive.org
That is a great resource !
Thank you very much for that !
Nevertheless, it must be said that DSD is a form of sigma-delta modulation, not delta modulation, which is a different thing.