Yes, already for many years, I have also used par2create/par2verify for adding redundancy to archive files and repairing any corrupted files.

However, I use both par2create and duplicate storage media, because duplicates that are preferably stored in different geographic locations are the only solution that guards against incidents so serious that they would destroy partially or totally the storage device.

By itself, when an adequate amount of added redundancy is chosen, par2create is sufficient to recover archive files that are only affected by a few sporadic corrupted sectors, like on a HDD that has been stored in good conditions for some years. It will not help if the entire HDD becomes unusable, due to some mechanical or electrical defect, which may happen in HDDs used for cold storage, instead of being used continuously.