I had assumed, from a combination of the title and my intuition about 2020, that desktop computing would be enjoying a resurgence. My thinking: many of us are stuck at home and desktop computing is the premium computing experience—especially for enthusiasts, gamers, content creators, engineers, programmers, etc. We're no longer carrying a computer to and from an office each day, so the value of a laptop is diminished. In fact, when my laptop died in April, I didn't replace it for several months because my home workstation is what I'm using every day and I wasn't traveling anywhere.
I suppose enthusiasts don't really count for a big enough market to lift the numbers. Still I would have expected 2020 to be flat on desktop computers, not dramatically down.