Ionbond appears to be a commercial name for a PVD process and nothing to worry about. They use the same process to coat HSS tooling for increased lubricity and tool life. HSS tooling is usually hardened to 65Rc or higher. Obviously if the process ruined the temper on tooling, they'd be gummy as mild steel.
I couldn't get the link for the salt-bath nitriding to work but I assume its similar or identical to ferritic nitrocarburizing, also known by trade names as Tenifer (Glock uses this European process) or Melonite here in the US. It's basically a case hardening process. I'm not sure what hardness it ends up being and what is the proper hardness range for a barrel. I'm not sure if having an exceedingly hard surface on a barrel is a good idea unless it's been proven to not give rise to any issues. (I don't know if it is or not since the link doesn't work and if it's already common practice)
“The practical success of an idea, irrespective of its inherent merit, is dependent on the attitude of the contemporaries." Nikola Tesla
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