Not true.
Take your first quote.
Here is the whole thing.
What he really says is the EXACT OPPOSITE of of what you dishonestly claim.

"With Cataclysm, David Stevenson draws on much recent work to provide a comprehensives account of the war, with a welcome interest both in the non-European theatres and in the home fronts. His book is also part of a more general attempt to rethink the meaning of the Great War and situate it in the history of the 20th century.

Like many of his fellow historians, Stevenson challenges much of the accepted wisdom – for example, that the generals had no ideas about how to break the deadlock – yet the prevalent view of the war remains under the influence of the highly critical literature of the late 1920s and early 1930s, with its emphasis on the horrors of the trenches and its portrayal of a futile struggle for obscure or ignoble ends, managed by inept political leaders and unimaginative generals. How many of us saw Oh! What a Lovely War with a slight sense of superiority to the people of the past, so easily duped?"