If this technique did help at all I think the effect was mainly psychological. Looking at a page with a bunch of words you don't know is stressful and demoralizing. Even being able to think that you have seen a character somewhere without knowing what it means can be comforting. It sounds silly but any amount of stress can severely inhibit language acquisition. You might be better off meditating for 15 minutes... Or taking drugs
The only thing that seemed to be 100% effective was readimg content that I was completely engaged in. It didn't matter if said content was close to my skill level or way beyond my skill level. As long as I am sufficiently engaged it doesn't matter how many times I have to reference the dictionary or comb google for grammar explanations.