I think he was referring to the fact that on Slashdot, commenters always ask for Linux support for every newly released product.

Why is it so specific to Slashdot though? If some product doesn't support Linux - you can expect such questions everywhere.

Only on forums with a Linux user population of over, say, 1%. Which is a very tiny number of forums.

We aren't talking about random forums. Most of them aren't focused on technology or gaming technology as an example. So it's not unexpected if they are (like here).