What does Report is 201 commits behind head on master mean?

[jsoref]

Here's the beginning of a comment produced by codecov:

Codecov Report

         ### [Codecov](https://app.codecov.io/gh/nektos/act/pull/2755?dropdown=coverage&src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nektos) Report

Attention: Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.

Project coverage is 74.64%. Comparing base (5a80a04) to head (8027284).
Report is 201 commits behind head on master.

The PR has a single commit: https://github.com/nektos/act/pull/2755/commits
That commit is nektos/act@8027284
Its parent commit is nektos/act@324bab6

Which afaict is master:

https://github.com/nektos/act/commits/master

So: What does Report is 201 commits behind head on master mean?