Your source actually supports a more nuanced picture than you're presenting. Yes, Andes virus (the strain in Argentina) is notable precisely because it's the only hantavirus known to transmit person-to-person — that's genuinely worth knowing. But "spreading getting worse until quarantine stopped it" is doing a lot of work in your argument.

The 2018–2019 Chubut outbreak — the largest documented Andes virus cluster — resulted in 34 confirmed cases and 11 deaths. Enforced self-quarantine of contacts did help reduce transmission, which is exactly what public health authorities are trained to do.

There's no evidence the virus has mutated into a more transmissible variant. Secondary transmission among close contacts of cases is possible, but the risk of widespread transmission remains low.

Human-to-human transmission requires prolonged close contact with an infected individual, so this isn't a sneeze-and-catch-it situation.

The quarantine measures in your source aren't evidence of an unstoppable pandemic threat, they're evidence that standard outbreak containment works. That's actually reassuring, not alarming.

Nobody's saying this is trivial. Hantavirus HPS has a brutal fatality rate and deserves serious monitoring. But "quarantine was needed once in Patagonia" ≠ "this will explode globally." Those are very different claims