Even for radial free-fall from infinity into a Schwarzschild black hole, the optical effects are actually extremely similar to what you would expect simply from aberration plus kinematic Doppler shifts in flat spacetime. If you look at some of the animations on youtube that were done by people...
I've been seeing popularizations recently that talk as though it's widely accepted that astrophysical black holes contain CTCs. Example: https://www.abc.net.au/news/2023-01-04/are-black-holes-time-machines-yes-but-there-s-a-catch/101822002
Is this accurate? Eternal black hole solutions contain...