While I think you have described this hearing fairly accurately, I think you are misreading the ramifications of this hearing.
It needs to be undestood that this hearing is NOT meant to offer up things to later be presented in the trial itself, but rather to dispose of those issues in advance, of how ARCCA came to do testing for this case, without burdening the jury to have to hear and deal with the issue.
That issue will get decided in the hearing AND that genesis will be how ARCCA as a company (or set of experts) is presented to the jury. But then ARCCA's work (and superior expertise in such things) will be allowed to be presented, as the experts they are. They ARE used by FBI and other govt people a lot, because they are so elite. That can now be made apparent.
One other thing that I would suspect will happen in T2 that we did not see in T1. In the original, ARCCA used a very limited set of data, merely testing the physics of car and injuries and whether they aligned. I would wager that in the interim, ARCCA has been asked to also look at, to test, and then be prepared to testify to the specifics of THIS case and how those can alter their conclusions (if at all).
I actually expect ARCCA's evidence to be even more compelling this time around, and more damning to Proctor, and the prosec as a whole, because it will be fully unleashed.