Indeed, this looks like a poor quality scan on an old monochrome Xerox machine or the like, not an actual attempt at redacting content. It's readable in Preview on macOS at the right zoom level.

Zoomed out, it all looks grey, but zoomed in, you can kind of read it.

this blackout is really weird -- if you're at 100% its unreadable, and as you zoom in it becomes more readable, peaking around 250% zoom... and if you go further it becomes more unreadable, and after like 450% it becomes totally unreadable again.

The overlayed pattern is also very specifically designed, and quite peculiar

looks like a greyscale image converted to 1-bit color with dithering. looks exactly like that, to me, actually

Looks like redactions got pwned by aliasing.