Nope, that's not a dry brine, really isn't such a thing (just to keep the term clear) brines and rubs do totally different things.
Pork (ribs and butts) for many tender to get a hammy taste if you put on a rub (that's salty) and let it sit over night. Some like that taste, but not me (in my butts and ribs). I never do mine overnight and put it on no more than 2 hours before.
As dense as a PB is, it would take days to truly brine it. But I have been known to inject my brines into the PB.