The article had been written in response to the couple's recent Netflix docuseries "Harry & Meghan", in which they were highly critical of the voracious UK tabloid press.
The king also commended charities for their "extraordinary work in the most difficult circumstances".
Katie Nicholl says the British royal family will possibly put a stop to all the Duke and Duchess' claims.
In the "Harry & Meghan" series the Duchess of Sussex said she did not know how to curtsy to Queen Elizabeth II.
The Duchess of Sussex is reportedly a generally "dislikable person" who is in control of the Duke of Sussex.
The Duchess of Sussex read out loud a text from Beyoncé in "Harry & Meghan."
The Duchess of Sussex claimed she did not receive protection from the photographers stalking her.
The actress denied any romantic associations with the royal when he was only 18 years old.
The Duke of Sussex allegedly suggested that his grandmother was under the control of The Firm.
Kate Middleton's uncle called the Netflix series "unfair" and alleged that it contained lies.
A "super-recogniser" says the Duke of Sussex has the same "very close-set, small but extremely sharp eyes" as the British monarch.
Royal experts claimed that the Duke and Duchess of Sussex are only further severing their ties with the royals following the release of their Netflix series.
The Duke and Duchess of Sussex accused Kensington Palace of briefing against them to the press in "Harry & Meghan."
The Duke and Duchess of Sussex lived in the cottage on Kensington Palace grounds before they moved to Frogmore Cottage in Windsor.
Prince Harry accused his brother William of a furious response to his plans to quit royal life but insisted he had few regrets about leaving in final docuseries episodes out on Thursday.
The Duke and Duchess of Sussex have been accused of capitalising on their royal titles as they continue to criticise The Firm.
It reportedly only takes one Sussex-obsessed individual to target King Charles III or even the Wales' children.
The Duchess of Sussex re-enacted the curtsy she did when she first met the late monarch.
The latest trailer for Prince Harry and Meghan Markle's Netflix show has been described by one royal expert as "quite an escalation", while another said the "gloves are off."
The late princess allegedly feels angry at how the Duchess of Sussex was made to "feel like a prisoner."
The first episode of "Harry & Meghan" included a clip from Princess Diana's Panorama interview.
The first episode of the docuseries showed the Duke of Sussex talking about the challenges that royal women must withstand.