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It might affect the content installed on vWii (like saves, installed channels etc.), but it doesn't reinstall clean IOS.
On Wii, when formating, it never downgraded the IOS back to clean system menu v1.0 (or 0.8) state.
Unfortunately, the console doesn't keep a clean version of files that shouldn't be edited by games or the users.
I don't know if formating WiiU mode really affected your patched/edited vWii IOSes, but I find it technically not possible.
It could be done, if WiiU had a backup of a vWii clean NAND, but I don't think it's the case, it would waste WiiU NAND space for nothing. nintendo wouldn't store data for something which should (normally) not be touched by the end user.
On Wii, when formating, it never downgraded the IOS back to clean system menu v1.0 (or 0.8) state.
Unfortunately, the console doesn't keep a clean version of files that shouldn't be edited by games or the users.
I don't know if formating WiiU mode really affected your patched/edited vWii IOSes, but I find it technically not possible.
It could be done, if WiiU had a backup of a vWii clean NAND, but I don't think it's the case, it would waste WiiU NAND space for nothing. nintendo wouldn't store data for something which should (normally) not be touched by the end user.