A sample status proc primary build, the demo video shows a similar build, but with a riven (ideally you want one, as the [Strun] scales well with them). Ideal riven stats are multishot and status chance. If you can get +status chance of 150% or higher from a riven, you don't need any 60% dual elemental/status chance mods (beware a possible UI issue on rivens that give precisely 150% status chance, theres a chance they give slightly less).
This build is a companion to my Umbral [Eternal War] [Valkyr] Build.
Basically, by building 100% status chance BEFORE ADDING THE STATUS CHANCE THROUGH MULTISHOT, you guarantee that every pellet in your shotgun's spread procs a status (if you don't hit this value, your status chance is divided among pellets, which is far less effective). If you shoot something with this shotgun, and then hit it with a [Condition Overload] melee, it generally falls over pretty fast. Not to mention, if your main elemental damage is corossive, you'll shred a ton of armor through procs.
Umbral Eternal War Valkyr Build: https://overframe.gg/build/1042/
Sample Melee Build: https://overframe.gg/build/1050/