Perhaps it's worth it adding this as a note at the top of the post, maybe mentioning alternatives, such as an Actually Portable™ build of `pigz`[1] or just a windows build of zstd[2].
I don't think the port itself is very old. The latest version of original pigz seems to have been released in 2023 [1], and the port seems to be of pigz from around that time[2]
The port itself is very old and therefore very outdated.