Nobody in these accounts describes anything breaking. The only mechanical note is the tight tolerances, raised as a compatibility caveat when fitting other burrs rather than as a fault. No owner mentions a repair, a replacement, or contact with the maker.
That is because the long-term record here is thin. Eighteen accounts were labelled, no theme drew more than two separate owners, and several of the comments are about rival grinders (the Zerno Z1, the Niche, the Philos) with the P80 mentioned in passing. There is not yet enough here to say how a P80 holds up after years of daily use.