I noted this on your similar muffwiggler post, but I’ll mention it here too. I’m pretty sure the issue is that you’re presumably inputting a composite signal, but you’re taking the component outputs from the input section. Since you’re just using a composite video signal, there’s no color information going into the input section (this module doesn’t decode the color from composite signals), so you should take the LUMA (brightness) output from the input section. If you remove the other (black) cables from the input section and just move the left part of the white cable up one jack, you should get your video.
If you want to input color input as in that LZX video you linked to, you need to use component (YPbPr) input. (Admittedly, that LZX video is a little confusing since it looks like they’re using a composite+audio RCA cable to input a component signal, and that particular cable has labels on the ends so it says “video” on the top one and “audio L” and “audio R” on the others if you look close. I can see how this could give one the impression that normal composite video input will be decoded as a color signal with this module.)
Disclaimer: All that said, I’ve never touched a Visual Cortex in my life, so if I’m wrong I hope someone will correct me.