What heresy do you speak of?
If you look at the primary sources, they wanted to return to NT Christianity, opposed infant baptism, and opposed the chickenshit church leadership that departed during the persecutions, and wanted to come back in as if nothing happened.
So, yeah, Maureen Tilley was one of my professors.
The logical result of Donatism is to assert that the power of the sacraments comes from the righteousness of the human minister, rather than from Christ himself with the minister being merely a visible mediator or stand-in.
I don't think you really want that.