Anything with gravity distorts time. Black holes just have a lot of gravity.
What does it mean to distort time? It means you change the effect of moving forward in time by 1 second. You can imagine time as a line on the ground, and every second you walk north along that line by 1 feet. So your total northward progress is one feet per second. Now imagine that the line goes up and then down a hill. Walking the same one foot up and down the hill actually results in less than one foot of progress northward. This ‘hill’ is the distortion caused by gravity. This is why you sometimes see the representation of spacetime distortion as a curved 2D sheet
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