It looks like the interface, events and scheduler are in place for republishing IPNS records. However the feature does not do anything at the moment.

https://github.com/ipfs/helia-ipns/blob/d954e0a74eceeb9f6e1b3aa9a49448b79ca3aca7/packages/ipns/src/index.ts#L209-L243