Notice in the quote that I said some of it went about 1/3 to the left, not all of it. In your eagerness to be a PITA you pounced before you looked. But being you, I don't expect you to say anything productive.
Again, we go back to Occam's razor. Some of it went 1/3 to the right, so like 10-20 degrees. You do realize this is a major change? Stranded wire does not do this. Copper / silver does not do this. A significant shift in the frequency response on only one side could do this. In your eagerness to blame stranding, you did not think. You have assigned a conclusion without any consideration to whether that conclusion even makes sense or is possible.