Fuck it, here's what it says...
Including walk-ons, UNC currently has room for four transfers after accounting for recent high school signees, graduating players, and those who have declared for the Transfer Portal. However, based on what I’ve gathered, the more realistic number is around 10 — a figure that would increase further with additional attrition.
It literally says we currently have 4 spots but that, based on what he's gathered, the more realistic number is ~10. To go beyond ~10 would require "additional attrition" beyond what he's gathered we'll likely have.