People more often talk about "4k intros" or "64k intros" to be clear (intros being size-restriced demos), often retro-people at events also but then people talk about the "C-64" in those cases (and the technologies and capabilities used is so different that it's hard to confuse the two in practice).

The article yes, many people use linux,osX or BSD though so some productions using them pop up from time to time even if the majority is windows based. Some people do 64k's (or 40k's) for old Amiga computers also but those have other constraints so generated meshes aren't as popular.