If it is a statement from a spokesperson, I consider it a statement from one or both Sussexes. And of course for a statement of this nature, you would expect them to be very involved in the crafting of the statement and signing off on what got released. Personally I think that this is all Harry, both the fakakta front end where according to
a CNN article:
And then the backend part where, to my eyes, since the harrowing experience did not get reported on, The Sussexes, specifically Harry IMO, decided to issue a statement which then made the incident worldwide news. The following is a quote from
a Daily Beast article, I am not posting it as news, rather because I agree with the sentiment being expressed and it is stated better than I could have.
P.S.
I did redact parts of the CNN article, the redacted parts were not relevant to my point but I don't want to appear like I am deliberately omitting information. Thomas Buda and and another security person Chris Sanchez made statements like, "never seen [or] experienced anything like this", "the public were in jeopardy at several points," "reckless driving from the vehicles that tailed [the Sussexes]". Having said that I think that a key contributor to the chaos comes from the cat and mouse scheme that the security firm / personnel enabled.