It's certainly a sign of something. Not positive at best neutral. As you say it's at best an indication that the author doesn't like writing.

Could it be an indication that the author didn't write the actual code? Is it a sign that the author doesn't really care that much about their project and furthermore could that be a sign that the project is also be be valued by us as much as the author? Maybe the code quality and documentation is less important than the utility. After all many of us don't like writing tests for code!

Perhaps but perhaps we just need to get used to these signs too and get over it.