In a recent social media tirade, Omid Scobie draws parallels between himself and Princess Kate.
Since December 2023, the Princess of Wales has remained out of the public eye following her January abdominal surgery.
On Tuesday, the Palace issued a concise health update, reporting that the princess's recovery is progressing positively.
This update came as Prince William unexpectedly dropped out of attending a planned memorial service in St George's Chapel for the late King Constantine.
Royal biographer Omid Scobie, who is often referred to as a mouthpiece for Meghan Markle and Prince Harry, has taken to social media to offer his opinion on the Princess of Wales's privacy.
Scobie wrote on X, formerly Twitter: "While I firmly believe the Princess of Wales should be allowed to recover without disturbance or prying, it's bizarre to me that the same conscience-free papers who hack, harass, who made me feel unsafe by flying drones to stalk me, have suddenly learned the meaning of privacy."
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The royal commentator added a screenshot of a story from the leading gossip website on his social media post, which enquired about Scobie's whereabouts after publishing Endgame last November.
Endgame included multiple statements about the Princess of Wales, where theauthor referred to her as "Stepford-wife-like".
In addition, Kate and King Charles were named, as a result of a publishing error, as the two royals involved in the alleged racism row over Prince Archie's skin colour in the Dutch version of the book.
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This book came three years after Scobie's controversial biography of Meghan Markle and Prince Harry, Finding Freedom.
In 2021,the duchess apologised in courtfor failing to remember authorising a senior aide to brief Scobie and Durand.