That article even says (it’s in the title of the link!) that sales rose in 2023. Based on the extracts in their annual report, that has definitely been contributed to by Harry, as Spare was their biggest seller.
The link also states quite clearly that the Group’s drop in pre-tax earnings was due to “higher costs and the negative impact of exchange rates”. Which impact them globally, has nothing to do with Harry, and aren’t controllable.
To put it another way - imagine how much more the higher costs and interest rates would have impacted their bottom line profit if they hadn’t been buffeted by the sales of Spare in the PRH division? I imagine the team that secured that Prince Harry contract would be receiving very large bonuses indeed.
And I think everybody knows that this book was the one and only golden egg from this particular goose…