Theres more to unpack here than im getting into, but thats not how metallurgy works.
At a high level, erosion and temper are not the same thing.
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The brake rotors on my truck are Nitrocarburized.
Very, very similar to the Nitride you are talking about granting a slightly different process...
Between the resistance to heat damage and the corrosion resistance they are superior to 'regular' run of the mill / cheap rotors. Zero warpage so far after almost 30k of abuse. Look and 'feel' like brand new rotors still.
As to Faxon barrels, the company states,
"We stand behind everyone one of our products. Bottom line, if at any time you feel a barrel is not up to expectations, the team here is ready, willing, and enthusiastic to earn your trust and satisfaction."
I've had to send Faxon items back and their CS was top notch. I've also had great accuracy out of competitively priced barrels. Specifically, it was a 6.5 CM, fluted match barrel, but it was a .6 moa barrel with several match ammo selections. I've also had one 5.56 barrel, zero issues with that one and it shot well.
Hope this helps with confidence.
Blessings,