Prince Harry remains the founder of Travalyst, and is mentioned twice on their "About" page, as the Founder and Patron, caps theirs.
It seems good corporate governance to not make your founder and patron a member of the board, particularly given the incredible growth of the initiative. It shows that this is not a one-man band.
But no doubt, the Travalyst people don't know as much about who is involved in their own company as random posters on Mumsnet!
Some gentle advice: Harry (and Meghan) are doing well, and will have their drawbacks and challenges. If you get joy from their failures, you may want to moderate expectations. They will have their losses, but they are will also have their gains.
https://travalyst.org/about/#:~:text=Our%20Board%3A,Executive%20–%20Forum%20for%20the%20Future