well, i don't take issue with a school. Martial arts is an unregulated industry and anybody can offer and teach what they like. However, it is not cool to associate oneself with an established clan when they are not actually part of that clan, have never been invested into that clan and have no right making claim to the materials of that clan.
So, if the Chong's have a viable system of martial arts that they created and systematized and now teach and propagate, that's fine. Call it what it is that's all.
Dave can be abrasive, but if you want to shut him up, then put up the propers and that will be that.
In the meantime, that lineage chart is a huge insult as it sits at this time.