I provided Red Bulls head mechanic Phil Turner's account for how the car is assembled.
An F1 car is not an off the shelf one size fits all jack of all trades mechanic can simply assemble. Turner goes into that.
Each mechanic has their specific role.
Turner describes it as "bespoke".
What that means is specifically tailored to that individual part of the car.
He even outlines it. "We build it in pieces"
Front end mechanic does front end, number 1 mechanic does fuel lines, PU guys do install. BESPOKE.
Turner also says he will get his hands dirty
"If the need arises". Ie sickness.
Being head mechanic it is absolutely essential for him to know everything. If he came out and said BS, then there's validity to "ridiculous" attacks had he been the source of the denial.
There is no source to validate Calum being able to assemble the brake system.
That is pure speculation. It's not his job.
I can speculate too.
It's also bereft of logic to tell the entire assembly team what a hypothetical magic bullet device does unless they need to know.
Why on earth would a team develop (supposedly) magic bullet brake system and then tell the PU install guy all about it?
F1 is about IP retention. It goes without saying teams implement strict controls on who knows what.
My opinion is Calum genuinely doesn't know even if there was a system being deployed by RB. Because he wouldn't be in that information loop.