100%. I absolutely believe that this happened as Charles Spencer described. I was really unimpressed by the Palace statement with its insinuation that CS's grief must have caused him to misremember - without stating outright that he was wrong. If what CS said was false why not just say that?
They must be really upset that the decades of gaslighting and undermining Diana and boosting their own popularity has been set back by CS accusations. The cold fury shows in this statement.
But the default RF position is to protect its principals, either by covering up the truth or by outright lying. When the accusations against Andrew first came to light, the palace statement was that these were 'false and without foundation'. So they - the spokespersons of our Head of State - were happy to smear a sex trafficking victim as a liar in order to protect Andrew (and are protecting him to this day).