"The horizon is not a place, e.g. two points at the horizon are not spacelike separated. The horizon is lightlike meaning that the spacetime interval between any two points on it is zero. Anything anywhere at the horizon is simultaneously everywhere at the horizon."

If, for outside observers, infalling matter never enters the black hole, what happens to the matter's gravity? - Physics Stack Exchange
https://physics.stackexchange.com/questions/514686/if-for-outside-observers-infalling-matter-never-enters-the-black-hole-what-ha?atw=1