Maybe, just maybe, "the narrative is the market has lost billions or trillions and something new and catastrophic is occurring." because in fact something new and catastrophic is occurring!
The real impact of massive stay at home orders (or the alternative of massive numbers of hospitalizations) on company profits, company viability as ongoing concerns, and the downward spiral of reduced consumer spending is orders of magnitude greater than any mean reversion at this point. And it's in addition to any mean reversion, you can't just ignore its impact in and of itself, which is what our brilliant friend is advocating.