MBA 13" M4: still dithering

I downloaded Stillcolor, ran it, however the icon did not appear in the menu bar. I checked in the terminal: ~ % ioreg -lw0 | grep -i enableDither | | | | "enableDither" = No | | | | "enableDither" = No | | | | "enableDither" = No Then I opened the dark grey image on the full screen, recorded it on the iphone 11 with 240 fps, and there is still shimmering exactly as before disabling dithering. Any suggestions?