Russell in Wisdom of the West

This picture book by Bertrand Russell, Wisdom of the West, is pretty much along the lines of a condensed version of his 1945 History of Western Philosophy book, but with one singular exception: his lengthy treatment and seeming respect for philosophers like Kierkegaard and Heidegger; which by the way were excluded in his HWP book.

Oh true, he's no Hubert Dreyfus or Walter Lowrie in his discussion, but it looks like he had to compromise a lot by even discussing them.

The question is did Russell write this part of WW? Or did someone else? And why would Russell include them in his book?