It doesn’t spin that fast (linear speed) close to the helicopter, and any fuel leaking out of the wings during flight will fly outwards so you would be safe inside ;-)
However, I expect they pump the fuel from the helicopter body into the wings, and I wonder how they guarantee the seal between the two. Helicopters must continuously adjust the angle of attack of the wings, so it isn’t even a matter of a single fixed axis, and the chemical properties of hydrogen peroxide won’t make things easier.
Once it's started up, it's a centrifugal pump all on its own. You don't need a positive pressure pump on the body, the fuel would be sucked out and along the blades like a siphon.
That doesn't make the seal problem much easier, but it at least does mean that if a seal were to fail, it would fail safe without spewing h2o2 everywhere.
However, I expect they pump the fuel from the helicopter body into the wings, and I wonder how they guarantee the seal between the two. Helicopters must continuously adjust the angle of attack of the wings, so it isn’t even a matter of a single fixed axis, and the chemical properties of hydrogen peroxide won’t make things easier.