I don't mean to speak for the parent poster. But FTA: "Spanning the years 1937–2001, the collection should especially appeal to those with an avant-garde or musicological bent." The tracks cited by the parent are not avant-garde nor musicological, but popular. I think the point is valid and all but admitted.
Delia Derbyshire's groundbreaking work at the BBC Radiophonic Workshop deserves special mention here - her realization of the Doctor Who theme and pieces like "Blue Veils and Golden Sands" represent a crucial bridge between academic electroacoustic experimentation and more accessible electronic music.
All listed are excellent consumers of the techniques pioneered by the people on OPs list. It's not that the artists/examples you listed are bad, they're just not remotely on the same level as someone like Karlheinz Stockhausen. If you don't understand how the two groups are different you underscore your own point.