When did nitriding CHF become a thing?

I remember learning that this wasn’t done due to the cold hammer forging process imbuing a lot of stresses into the barrel that couldn’t be fully released. This would cause a higher incidence of failure during the nitriding process from the increased likelihood of the barrel warping due to those residual stresses. Also , even if the barrel came out of the nitriding process perfect, it would be susceptible to poi shift as the barrel heats up when shooting.

What am I missing here?

The price isn’t terrible, so I doubt they are getting a lot of bad barrels back from the nitriding treatment.