Not a good history - irrespective of whether one agrees with the author's theses about suffragette violence and it being the cause of delay in granting women's suffrage.
The claims are many, many of which are incorrect, creating a misleading history.
Reading a June 1914 issue of the magazine Votes for Women, by WSPU (only one of many suffrage magazines, of many larger organisations than WSPU), one can see the commitment to direct action with violence against property (not people). As a result, many people parted company with WSPU and more did with the beginning of the war.