^^^
You are correct there... Proof is in the pudding there.
I believe most all 6s line chassis' have the same identical chassis Kick up.
I could see a factory tolerance of +/-1-2 degrees with these Arrma chassis.
But once you button down the Bulkhead, Belcrank and ST top plate, the chassis is what it is, in the ball park, 7' ish degress

TLRT the same. I am sure the machined 7075 chassis, TLRT and EXB's have a much better tolerance. IDK.