This is of course to some degree true, but Delderfield shows himself aware of these issues in numerous places in all his books, as, for example here, when he says, regarding the memoirs of Napoleon's valet Constant that 'one cannot help feeling that he has no scruples about sacrificing the truth for sensational reading.'
Well, it's certainly both fun and informative, ranging from Caroline Colombier, Napoleon's first love, via streetwalkers, mistresses and wives, to his final female companions on the lonely isle of St. Helena. And what an amazing life Bonaparte lived, filled with epoch making war, statesmanship and, as here, love and sex. Also, where the vast majority of British writing is blatantly anti-Napoleonic, Delderfield is clearly a Boney-phile. For those who don't know much about this aspect of Bonaparte's incredible life, I won't spoil things by going into any detail, and for those who do know... well, you already know! I will just note that the catchphrase 'Not tonight, Josephine' makes no appearance, despite the author covering the whole subject fairly thoroughly.
Yet my own fairly obsessive interest in this area leads me to think that there has been a sea change in the way it's written about: most modern books tend to focus on more narrow aspects: a particular campaign, or a particular aspect of the era or the man (or other figures, like Wellington, Nelson, The Czar, etc.), whereas in years past treatments were often more holistic, e.g. Sir Walter Scott's many volume epic, recently published in a single abridged volume (The Life of Napoleon Buonaparte).