Worth reminding ourselves that the xz container format is awful. Actually, a lot of people don't realise that xz is a container, and not the compression format.
You can tell xz isn’t so bad by the complete absence of any real world report of xz causing issues.
Describing it as a "polemic" seems like an overly emotional reaction. Did you actually read it? It seems a well-researched, well-informed article to me, with solid verifiable facts.
But for the specific scenario cited of historical archivists and preservation, I think it's reasonable to say "run zfs or a similar solution and closely monitor/replace the disks over time". That sounds more likely to work than building resilience into the equivalent of .zip and hoping those tools will recover such an error.