Lua 5.0 doesn't have the incremental garbage collector, only the original mark-and-sweep collector. The pdf they based the blog post off of even says the incre

Lua 5.0 doesn't have the incremental garbage collector, only the original mark-and-sweep collector. The pdf they based the blog post off of even says the incremental GC is upcoming in 5.1, and you can read through https://www.lua.org/source/5.0/lgc.c.html https://www.lua.org/source/5.0/lgc.c.html yourself and see that, unlike the 5.1 version, it only has a single mark list and doesn't use the tri-color scheme.