Rough Water you are not correct. I had an email last year, direct from Weatherby confirming they still have their brass made by Norma. I emailed them and asked because it used to be right on their website and did not show there any longer.
As far as Nosler making brass -
Nosler has been made by Norma for years-- but they were supposed to weight sort, prep and polish it more than Norma did (hence the "premium pricing")
In 2013 Nosler bought out Silver State Armory and they started using SSA's machines to make brass for the "SSA" line of cartridges that they introduced in 2015. This even shows up in the History link you sent in your email. At first it was really bad, I mean really really bad (at least in the 6.8spc brass)-- they improved upon the SSA brass some what a few years ago--BUT as far as I know Nosler still only makes the "SSA by Nosler" brass NOT the regular Nosler brass on the SSA machines -- the "SSA by Nosler" only makes and sells 5.56 nato, 6.8spc, 300 aac, 308W, 30-06, and 7.62x39