Those counts seem to be wrong. Looking at the code, they seem to count the number of merge commits (commits with >1 parent). However, some nixpkgs committers al

Those counts seem to be wrong. Looking at the code, they seem to count the number of merge commits (commits with >1 parent). However, some nixpkgs committers also use GitHub's rebase merge option. This means the change went through a regular PR + review, but is merged without generating a merge commits. Secondly, some PRs have multiple commits, so even if everything is merged through a merge commit, the number of non-merge and merge commits may not be balanced.