His profile is PPP (project-protected profile), so it must be a project-managed profile. See details at https://www.wikitree.com/wiki/Help:Project-Managed_Profiles
The guidelines were recently clarified that, basically, if a project box is displayed, then the corresponding project account must be a manager. And the requirement that a project box is displayed if a profile is PPP has been in place for a few years.
To use the Magna Carta Project as an example, the benefit is that all the project's members/affiliates receiving e-mails from the project's "Profile Alerts" google group help watch over the profiles that the project manages or monitors (either by having WikiTree-36 as manager or on the trusted list).
The benefits work both ways - the profile benefits from having a project looking after it, but WikiTree members also benefit because they can join the project and watch over dozens/hundreds/maybe more profiles without adding them to their watchlist. I try to keep my watchlist to under 2,000 (1,000 is better, but it's been a while) and also restricted to primarily lineal ancestors. But I keep an eye on thousands of project-managed profiles through the google groups tied to the project accounts.