In the merged PRs section, the indicated number of comments only seems to count independent comments, not line comments on the diff.
Feedback: There's still uncertainty of whether a batch review should count as one comment total or one comment per line, or whether replies to line comments should count as comments, but I'd lean towards giving everything 1 point---the goal for me today was to see whether the person was making impactful changes (typically indicated by high participation from others) versus typo-fix-level contributions.