[PierceJoy]

I think the available evidence supports calling it very deadly to humans. As you said though, it's possible and even likely the CFR is overestimating. However I doubt you would see a 50% CFR equate to something low enough that wouldn't effectively be a disaster if human to human transmission began, and at a rate similar to the flu or covid. Let's pray that never happens or that we have an effective vaccine by that time.

[hedora]

Technically speaking, it cannot be more deadly than the flu, since it is the flu.

There’s some evidence of rapidly expanding asymptomatic human -> human spread of it.

Hopefully that strain acts as an effective vaccine against the one(s) responsible for the > 50% CFR.

[JumpCrisscross]

> it cannot be more deadly than the flu, since it is the flu

I’d say technically it’s not the flu. The flu is influenza A or B.