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.
They have local magnet/specialized programs in CA public schools that they use to attract good students to poorly performing schools for help goose up test schools.
This may be sampling bias as well. Having parents with the means, willingness, and involvement to do this is probably a strong predictor of success already.
