There's a technical difference here. There is no definition for "inbounds".
Excuse me, NF: 1-1-2, states pretty clearly, "The game of football is played with an inflated ball by two teams on a retangular field 360 by 160 feet........", and supported by the accompanying detailed diagram for an "11 player Football Field Diagram" at the front of the NFHS Rule Book establishes, somewhat specifically, what constitutes "inbounds".
For the first 100+ years, until 2003 or so when this Case Book interpretation briefly appeared (then quietly disappeared) people generally understood the difference between inbounds and OOB, because the differences MADE SENSE.
The effort to further explain, what seemed to already be generally understood, has evolved into an almost perfect example of "spinning wheels in soft sand". Considering the effort, elsewhere throughout the Rule Book to precisely separate Inbounds from OOB, the notion that a player, who clearly establishes himself as being OOB by touching the ground outside the "field of play" can somehow regain an inbounds status by simply jumping up into the air, while remaining beyond the the confines of the field of play, just doesn't pass any reasonable level of "smell test".