No they didn't; read the history. Donatists claimed basically that 'sinners' could not confer valid Sacraments. Neither the Eastern or Western Church accepted this; neither did the fathers of the 'reformation'.
Archbishop Chaput is not advocating Donatism at all.
It would be astonishing that a bishop who is advocating orthodox Catholicism should come under such an attack 'a sign of the times' perhaps. We only have to look to the drawn-out struggle St Athanasius had against Arianism against a preponderantly h*eritical Church at the time, even against a vacillating pope.
Athanasius was vindicated. The Pope eventually supported him and Arianism was eventually eradicated.
Centuries on it has raised its 'ugly head' once more. Today, the humanity of Christ is preached and promoted by many Catholic bishops and priests over against His Divinity putting His 30 year sojourn amongst us only on a par with Mahatma Ghandi and Nelson Mandela, et al.