50A surge protectors

I see they have one now with surge protection but I'm not seeing where it protects from miswired pedestals, bad freq. and open neutrals. Does it do that too?

AFAIK the Hughes autoformer only "protects" your rig from line source errors in the sense that it has indicator lights to warn you of an issue. However, unlike an EMS it has no ability to do anything about these errors, it merely tells you there is a problem, so if you still plug in any error will be passed on to your rig. An EMS in this same situation will not connect power to the rig even if you do plug in. This is all the more important if you're already plugged in and a problem then occurs - the Hughes will simply pass that error on to the rig, an EMS will instantly disconnect power to the rig. Ergo the reason for both if you want full protection - Source Power > Autoformer > EMS > Rig.