They substituted the default section 3 with their own version that is a lot more detailed and seems to be actually accurate.
加拿大民众研习麻将技艺 手持术语表练习牌局用语
，这一点在比特浏览器下载中也有详细论述
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The last official ATS2 release was version 0.4.2 in 2020. Development has continued on GitHub but there hasn't been a new release tarball. The ATS website still links to older releases. Most of the build instructions I found online are out of date or refer to release tarballs that aren't the best way to get started anymore. Building from the GitHub repositories requires building ATS1 (ATS-Anairiats) first since the ATS2 compiler is written in ATS1. This is where most of the problems are. The ATS1 repository has broken autotools symlinks, missing directories and issues with newer versions of macOS. I spent some time working through these and documenting the fixes here.