I think it is a bit more nuanced than that, the wiki states: "On the other hand, in the quarter century after the Black Death, it is clear that in England many

I think it is a bit more nuanced than that, the wiki states: "On the other hand, in the quarter century after the Black Death, it is clear that in England many labourers, artisans, and craftsmen, those living from money-wages alone, did suffer a reduction in real incomes owing to rampant inflation." So, nominal income might have gone up even while real income went down and either way wealth could have become more concentrated (which is what the BBC article is expounding on) even while laborers earned more.