Where does that 99% number come from?

The very reason why I bought a Steam Deck is because it is both a handheld and a Linux Desktop.

While I don't have data to support the number, I would say that it's a pretty safe bet to say that majority of Steam Deck owners do not use the desktop mode on regular basis, they might check out what it is, but the majority probably stays in the game mode.

Regarding your point, do realise that just by being a NH reader, you're in the 1%, not to mention all the other delineations that are commonly attributed to the HN crowd.

We are not the majority.