Very Long Baseline Interferometry (VLBI), as demonstrated by the Event Horizon Telescope, has successfully captured direct images of supermassive black hole shadows in galaxies such as M87.
The retrieved papers, particularly those from the Event Horizon Telescope collaboration (such as papers [0] and [3]), directly substantiate the claim that very long baseline interferometry has provided direct visual observations of supermassive black hole shadows. There are no papers contradicting this finding.