Discarding just the half of the poison solution and doing it 6 times just dilutes it down to 1/64th of the original concentration. I guess the video you mentio

Discarding just the half of the poison solution and doing it 6 times just dilutes it down to 1/64th of the original concentration. I guess the video you mention wants to debunk homeopathy, but the maths as you describe it doesn't work. (Homeopathy uses 1:100 dilutions, so that would be a different game. Indeed, I think I've heard that they don't even bother with diluting 1:100, they just discard the whole contents and use what's left inside accidentally.)