This means WAR !!!!!!!

Nah, it don't. But it is worth an observation.
No matter how wonderful anyone thinks what he is doing works, if he hasn't even seen the alternative in action, he honestly has no idea if the alternative even works, what it does, or much less how well it works.

It has been said many times that almost everyone who has flown the stock Skybolt loves it. And that the aileron rigging improvement does not cure problems that happen throughout the flight envelope, but do SEEM to give the airplane a bit cleaner response and appears to not do some of the things others who own Skybolts have seen.

It's also less work and a stronger installation to do the suggested rigging improvement setup. There are two motives. Have all 4 alierons move equally to equal stick input, AND the new rigging arrangement actually takes less time to do. And doesn't cost anything at all since it uses the supplied hardware with simple and quick modification.

I have actually flown Skybolts without the modification. And unlike the detractors of the rigging mod, HAVE flown the "differential thing". And I did notice that the OEM Skybolts seemed a touch "muddy" in response to tracking when ailerons were effective.

As for labeling it "the differential thing", that naming suggests whomever calls it such seems not to have understood the better rigging removes differential, not causes it.

But hey, this really isn't war over a little thing like that. We fly ARFs, and when you do, you accept a lot of little things you might or might not build into your model if you did build it. This is another, like getting a LitePly firewall, that is supported around the upper third by nothing but a 1/2" foam fuselage top sheeted with 1/16" balsa. If you only have time to improve one thing on that Chinese ARF interpretation of an excellent old US kit design, then put the time on the firewall improvements. Since you probably won't be building two Skybolts to compare the aileron response, and the OEM users are perfectly happy with what they did, doing the rigging improvement won't prove anything to you, but it will reward you with the knowledge that you do have an airplane where all 4 ailerons move the same amount at the same time. For whatever that's worth to you.