It only shows the outermost -- lowest-frequency -- part of the accretion disk. More internally, the higher electromagnetic frequencies are sufficiently weaker in intensity in our direction of sight to be invisible to us. Especially so the ”jet.”
The region of the black hole in the middle would become blazingly bright if the angle of vision was head-on instead of slanted.
(I renounce of saying that the black hole in the middle is, like all black holes, unfinished and hence does not possess an horizon.)
April 14, 2019
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