You may be joking, but I have several high achieving peers whose families did this with good results. The choice was: did they want to be in the best high school with the highest level of competition, or did they want to go to an OK school that had good magnet programs and less competition. my sample size is only about three, but it worked out well for them.
I don’t think the GP is joking, but they may not have realized that this strategy is already well known. A lot of families won’t uproot themselves for it, though.