You sir are correct.
Like I said , all anybody has to do is read the link I furnished in my last reply to ascertain that it was indeed a "joke".
The norm for every gear change is a totally quiet gear change. (and there are probably tens of thousands of that procedure done every year where noise is not an issue after the fact.)
The only "times" I've had noise after the gear change, involved 1. a guy that didn't know what he was doing. Not only did that guy destroy a new set of gears for me, he ruined a 9" center section pinion support as well. 2. An incorrectly spec'd Motive gear set intended for off road 4WD applications where it wasn't a big deal to have a noisy gear set.
I bought those gears from a guy at Barnett that didn't know that that was the deal w/ the gears, and ended up getting a full refund.
That refund got applied to a Motorsport gear set,
quieter than a mouse.
And I didn't even need a cryo freezer for that either.