Or in context, they estimate NYC lost a net 0.8% of its residents and the average income of the incoming and outgoing cohorts differ by -$8,055/y. It multiplies to a big dollar figure because NYC is big and rich.
The original content marketing: https://global-uploads.webflow.com/5dc3e2af6a906d9cc232e1bc/...
It explains that they're extrapolating from three NYC neighborhoods (Astoria, Tribeca, and Williamsburg). I'm not an NYC expert and I'm not going to research these claims further, but I think those are quite well-off neighborhoods and not likely representative of NYC in terms of income or pandemic mobility.
This article feels like Reuters lightly rewrote an ad for Unacast.