Yes, that's correct. A voter who was formerly registered but purged would still be able to cast a provisional ballot. However, that ballot will not be counted unless they can provide proper identification and proof of residency if the residency is questionable. If those requirements are met, and if a GOP and Democrat member of the county Board of Elections for the county in which the ballot was cast agree that the ballot is valid, then and only then will the ballot be counted. Ohio's ID requirements are stringent without being onerous, so electors attempted to cast a ballot in good faith will have no problem meeting them.
I am a GOP member of a county Board of Elections in Ohio. As mentioned upthread, the applications for receipt of absentee ballots were mailed a week ago, and the majority of counties have no record of which registrations were purged from the rolls, so there will be no "do over".
My memory says that this not a new process the court has struck down but a decades old one. Voting was one way to recertify. Not voting for 2 or 3 consecutive elections required recertification. IOW, prove you still reside in that precinct. Made perfect sense to me and it wasn’t difficult or illogical. After all, driver’s licenses must be renewed, and fishing, hunting, business, etc. It makes sense to me.
And who can argue with purging dead people from the rolls? That’s a no-brainer.
Ohio should appeal to the full court and then to scotus. It’s rules are logical. It’s even in kasich’s interest to do so.