I feel you; I was more confused after the video than before knowing there was any "method" at all.
I think the grey levels are just there to distinguish between different pours. So you take the amount of water you want to use and divide it into chunks which you pour separately (with a 45 second delay between), and depending on how large you make each chunk you get different results. I.e., first chunk large = sweeter; fewer chunks in the last 60% = less strong.
I think the grey levels are just there to distinguish between different pours. So you take the amount of water you want to use and divide it into chunks which you pour separately (with a 45 second delay between), and depending on how large you make each chunk you get different results. I.e., first chunk large = sweeter; fewer chunks in the last 60% = less strong.